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1. Become fractured; break or crack on the surface only
   "The glass cracked when it was heated";
   - check, break
    
2. Make a very sharp explosive sound
   "His gun cracked"
    
3. Make a sharp sound
   "his fingers cracked";
   - snap
    
4. Hit forcefully; deal a hard blow, making a cracking noise
   "The teacher cracked him across the face with a ruler"
    
5. Pass through (a barrier)
   "Registrations cracked through the 30,000 mark in the county";
   - break through
    
6. Break partially but keep its integrity
   "The glass cracked"
    
7. Break suddenly and abruptly, as under tension
   "The pipe cracked";
   - snap
    
8. Gain unauthorized access to computers with malicious intentions
   "she cracked my password"; "crack a safe"
    
9. Suffer a nervous breakdown
   - crack up, crock up, break up, collapse
    
10. Tell spontaneously
    "crack a joke"
     
11. Cause to become cracked
    "heat and light cracked the back of the leather chair"
     
12. (chemistry) reduce (petroleum) to a simpler compound by cracking
     
13. (chemistry) break into simpler molecules by means of heat
    "The petroleum cracked"
     
14. (of a voice) change in pitch, esp. as a result of emotional strain
     
15. Yield information under interrogation or torture
    "They managed to crack him on the third day";
    - break
     
16. Successfully decipher a code
    - break

1. A narrow planar hole in a rock or material, usually with a flattish sides
   - cleft, crevice, fissure, scissure
    
2. A narrow space between things; a narrow opening
   "he opened the window a crack";
   - gap
    
3. A long narrow depression in a surface
   - crevice, cranny, fissure, chap
    
4. A sudden sharp noise
   "the crack of a whip";
   - cracking, snap
    
5. A chance to do something
   "he wanted a crack at the champion";
   - shot
    
6. Witty remark
   - wisecrack, sally, quip
    
7. A blemish resulting from a break without complete separation of the parts
   "there was a crack in the mirror"
    
8. A purified and potent form of cocaine that is smoked rather than snorted; highly addictive
   - crack cocaine, tornado
    
9. A usually brief attempt
   "he took a crack at it";
   - fling, go, pass, whirl, offer
    
10. The act of cracking something
    - fracture, cracking
     
11. [Ireland] A highly pleasurable or exciting experience
    "we had a crack at the party";
    - good time, blast, craic [Ireland]
     
12. (computing) a program, fake licence or procedure to circumvent software usage restrictions

1. Of the highest quality
   "a crack shot";
   - ace, A-one, first-rate, super, tiptop, topnotch, top-notch, tops

Derived forms: cracked, cracks, cracking

See also: superior

Type of: alter, attempt, blemish, break, break down, break in, break up, breakage, breaking, chance, change, cocain, cocaine, come apart, comment, decompose, defect, depression, effort, endeavor [US], endeavour [Brit, Cdn], experience, fall apart, gap, get, go, go across, go through, have, hit, impression, imprint, input, mar, modify, narrate, noise, opening, opportunity, pass, recite, recount, remark, retail[2], separate, sound, split up, suffer, sustain, tell, try

Encyclopedia: Crack