Underground Railroad Underground Railway | secret aid to escaping slaves that was provided by abolitionists in the years before the American Civil War |
quarterback signal caller field general | (American football) the position of the football player in the backfield who directs the offensive play of his team, quarterback is the most important position on the team |
signals intelligence SIGINT | intelligence information gathered from communications intelligence or electronics intelligence or telemetry intelligence |
cable railway funicular funicular railway | a railway up the side of a mountain pulled by a moving cable and having counterbalancing ascending and descending cars |
car railcar railway car railroad car | a wheeled vehicle adapted to the rails of railroad, three cars had jumped the rails |
cog railway rack railway | railway for steep mountains, a cogwheel on the locomotive engages cogs on a center rail to provide traction |
detonator detonating device cap | a mechanical or electrical explosive device or a small amount of explosive, can be used to initiate the reaction of a disrupting explosive |
elevated railway elevated railroad elevated el overhead railway | a railway that is powered by electricity and that runs on a track that is raised above the street level |
line railway line rail line | the road consisting of railroad track and roadbed |
locomotive engine locomotive engine railway locomotive | a wheeled vehicle consisting of a self-propelled engine that is used to draw trains along railway tracks |
railroad track railroad railway | a line of track providing a runway for wheels, he walked along the railroad track |
railway railroad railroad line railway line railway system | line that is the commercial organization responsible for operating a system of transportation for trains that pull passengers or freight |
railway junction | a junction where two or more railway lines meet or cross |
railway station railroad station railroad terminal train station train depot | terminal where trains load or unload passengers or goods |
scenic railway | small railway in an amusement park |
signal box signal tower | a building from which signals are sent to control the movements of railway trains |
yard railway yard railyard | an area having a network of railway tracks and sidings for storage and maintenance of cars and engines |
signal level | the amplitude level of the desired signal |
signal detection detection | the detection that a signal is being received |
signal signaling sign | any nonverbal action or gesture that encodes a message, signals from the boat suddenly stopped |
starting signal start | a signal to begin (as in a race), the starting signal was a green light, the runners awaited the start |
storm signal | a signal announcing the approach of a storm (particularly a storm of marked violence) |
time signal | a signal (especially electronic or by radio) indicating the precisely correct time |
alarm alert warning signal alarum | an automatic signal (usually a sound) warning of danger |
distress signal distress call | an internationally recognized signal sent out by a ship or plane indicating that help is needed |
reveille wake-up signal | (military) signal to wake up |
telegraphic signal radiotelegraphic signal | a signal transmitted by telegraphy |
visual signal | a signal that involves visual communication |
traffic light traffic signal stoplight | a visual signal to control the flow of traffic at intersections |
flag signal flag | a rectangular piece of fabric used as a signalling device |
code flag nautical signal flag | one of an international code of flag signals used between ships |
blinker turn signal turn indicator trafficator | a blinking light on a motor vehicle that indicates the direction in which the vehicle is about to turn |
electronic signal | a signal generated by electronic means |
signal fire signal light | a fire set as a signal |
input signal input | signal going into an electronic system |
output signal output | signal that comes out of an electronic system |
background background signal | extraneous signals that can be confused with the phenomenon to be observed or measured, they got a bad connection and could hardly hear one another over the background signals |
signal | any incitement to action, he awaited the signal to start, the victory was a signal for wild celebration |
quarterback signal caller field general | (football) the person who plays quarterback |
trainman railroader railroad man railwayman railway man | an employee of a railroad |
signal | an electric quantity (voltage or current or field strength) whose modulation represents coded information about the source from which it comes |
radio signal | a radio wave used to transmit and receive messages |
signal-to-noise ratio signal-to-noise signal noise ratio signal noise S N | the ratio of signal intensity to noise intensity |
explode irrupt | increase rapidly and in an uncontrolled manner, The population of India is exploding, The island's rodent population irrupted |
explode burst | burst outward, usually with noise, The champagne bottle exploded |
detonate explode blow up | burst and release energy as through a violent chemical or physical reaction,the bomb detonated at noon, The Molotov cocktail exploded |
explode burst forth break loose | be unleashed, emerge with violence or noise, His anger exploded |
explode detonate blow up set off | cause to burst with a violent release of energy, We exploded the nuclear bomb |
explode | show (a theory or claim) to be baseless, or refute and make obsolete |
explode | show a violent emotional reaction, The boss exploded when he heard of the resignation of the secretary |