| 单词 | speed |
| 释义 | speed n. & v. --n 1. rapidity of movement (with all speed; at full speed). 2. a rate of progress or motion over a distance in time (attains a high speed). 3. a a gear appropriate to a range of speeds of a bicycle. b US or archaic such a gear in a motor vehicle. 4. Photog. a the sensitivity of film to light. b the light-gathering power of a lens. c the duration of an exposure. 5. sl. an amphetamine drug, esp. methamphetamine. 6. archaic success, prosperity (send me good speed). --v (past and past part. sped) 1. intr. go fast (sped down the street). 2. (past and past part. speeded) a intr. (of a motorist etc.) travel at an illegal or dangerous speed. b tr. regulate the speed of (an engine etc.). c tr. cause (an engine etc.) to go at a fixed speed. 3. tr. send fast or on its way (speed an arrow from the bow). 4. intr. & tr. archaic be or make prosperous or successful (how have you sped?; God speed you!). Phrases and idioms at speed moving quickly. speed bump (or hump) a transverse ridge in the road to control the speed of vehicles. speed limit the maximum speed at which a road vehicle may legally be driven in a particular area etc. speed merchant colloq. a motorist who enjoys driving fast. speed up move or work at greater speed. speed-up n. an increase in the speed or rate of working. Derivatives speeder n. Etymology: OE sped, spedan f. Gmc |
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