change-up
change-of-pace
change-of-pace ball
off-speed pitch | a baseball thrown with little velocity when the batter is expecting a fastball |
speed
speeding
hurrying | changing location rapidly |
| speed skating | competitive skating on speed skates (usually around an oval course) |
| trap block | (American football) an illegal block |
mousetrap
trap play | (American football) a play in which a defensive player is allowed to cross the line of scrimmage and then blocked off as the runner goes through the place the lineman vacated |
| radar fire | gunfire aimed a target that is being tracked by radar |
ambush
ambuscade
lying in wait
trap | the act of concealing yourself and lying in wait to attack by surprise |
| trap-door spider | American spider that constructs a silk-lined nest with a hinged lid |
| air search radar | a shipboard radar that searches for aircraft |
amphetamine
pep pill
upper speed | a central nervous system stimulant that increases energy and decreases appetite, used to treat narcolepsy and some forms of depression |
bunker
sand trap
trap | a hazard on a golf course |
| Doppler radar | radar that uses the Doppler shift to measure velocity |
| early warning radar | a radar that is part of an early warning system |
| fire control radar | naval radar that controls the delivery of fire on a military target |
land mine
ground-emplaced mine
booby trap | an explosive mine hidden underground, explodes when stepped on or driven over |
| naval radar | naval equipment consisting of a shipboard radar |
radar
microwave radar
radio detection and ranging
radiolocation | measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects |
radome
radar dome | a housing for a radar antenna, transparent to radio waves |
| speed bump | a hindrance to speeding created by a crosswise ridge in the surface of a roadway |
speedometer
speed indicator | a meter fixed to a vehicle that measures and displays its speed |
speed skate
racing skate | an ice skate with a long blade, worn for racing |
| steel trap | a trap made of steel with a strong spring and sharp toothlike projections to hold the prey |
suntrap
solar trap | a terrace or garden oriented to take advantage of the sun while protected from cold winds |
| surface search radar | a naval radar to search for surface targets |
three-dimensional radar
d radar | radar that will report altitude as well as azimuth and distance of a target |
| trap | a device in which something (usually an animal) can be caught and penned |
| trap | a light two-wheeled carriage |
| trap | a device to hurl clay pigeons into the air for trapshooters |
| trap | drain consisting of a U-shaped section of drainpipe that holds liquid and so prevents a return flow of sewer gas |
| trap-and-drain auger | a plumber's snake for clearing a trap and drain |
| trap door | a hinged or sliding door in a floor or ceiling |
| weather radar | radar that is able to detect clouds and precipitation |
speed
swiftness
fastness | a rate (usually rapid) at which something happens, the project advanced with gratifying speed |
| execution speed | (computer science) the speed with which a computational device can execute instructions, measured in MIPS |
trap
cakehole
hole
maw
yap
gob | informal terms for the mouth |
| steel trap | an acute intelligence (an analogy based on the well-known sharpness of steel traps), he's as sharp as a steel trap, a mind like a steel trap |
pitfall
booby trap | an unforeseen or unexpected or surprising difficulty |
trap
snare | something (often something deceptively attractive) that catches you unawares, the exam was full of trap questions, it was all a snare and delusion |
| iron trap | a trap from which there is no escape |
| speed trap | a trap arranged on a roadway for catching speeders |
| speed limit | regulation establishing the top speed permitted on a given road |
blip
pip radar target | a radar echo displayed so as to show the position of a reflecting surface |
| radar echo | an electronic signal that has been reflected back to the radar antenna, contains information about the location and distance of the reflecting object |
radar beacon
racon | a device that, on receiving radar signals, transmits coded signals in response to help navigators determine their position |
| trap line | a line or series of traps |
motorcycle cop
motorcycle policeman
speed cop | a policeman who rides a motorcycle (and who checks the speeds of motorists) |
speeder
speed demon | a driver who exceeds the safe speed limit |
| speed freak | addict who habitually uses stimulant drugs (especially amphetamines) |
speedskater
speed skater | an ice-skater who races competitively, usually around an oval course |
focal ratio
f number
stop number
speed | the ratio of the focal length to the diameter of a (camera) lens system |