Crack



GRE TOEFL

解释

GRE 红宝书

• n. 裂缝, 裂纹
• ［英］ n. 裂缝, 裂纹 ( line along which sth has broken)
• ［例］ a cup with bad cracks in i

Webster Collegiate

kI. verb

• Etymology: Middle English crakken, from Old English cracian; akin to Old High German chrahhōn to resound
• Date: before 12th century
• intransitive verb
  • 1. to make a very sharp explosive sound <the whip cracks through the air
  • 2. to break, split, or snap apart
  • 3. fail: as
    • a. to lose control or effectiveness under pressure — often used with up
    • b. to fail in tone <his voice cracked
  • 4. to go or travel at good speed — usually used with on<the steamboat cracked on
• transitive verb
  • 1.
    • a. to break so that fissures appear on the surface <crack a mirror
    • b. to break with a sudden sharp sound <crack nuts
  • 2. to tell especially suddenly or strikingly <crack a joke
  • 3. to strike with a sharp noise ; rap <then cracks him over the head<cracked a two-run homer in the fifth — New York Times
  • 4.
    • a.
      • (1) to open (as a bottle) for drinking
      • (2) to open (a book) for studying
    • b. to puzzle out and expose, solve, or reveal the mystery of <crack a code
    • c. to break into <crack a safe
    • d. to open slightly <crack the throttle
    • e. to break through (as a barrier) so as to gain acceptance or recognition
    • f. to show or begin showing (a smile) especially reluctantly or uncharacteristically
  • 5.
    • a. to impair seriously or irreparably ; wreck <crack an opponent's courage
    • b. to destroy the tone of (a voice)
    • c. disorder, craze
    • d. to interrupt sharply or abruptly <the criticism cracked our complacency
  • 6. to cause to make a sharp noise <cracks his knuckles
  • 7.
    • a.
      • (1) to subject (hydrocarbons) to cracking
      • (2) to produce by cracking <cracked gasoline
    • b. to break up (chemical compounds) into simpler compounds by means of heat

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