crack (Noun) — A narrow planar hole in a rock or material, usually with a flattish sides.
crack (Noun) — A narrow space between things; a narrow opening. ex. "he opened the window a crack"
crack (Noun) — A long narrow depression in a surface.
crack (Noun) — A sudden sharp noise. ex. "the crack of a whip"
crack (Noun) — A chance to do something. ex. "he wanted a crack at the champion"
crack (Noun) — Witty remark.
crack (Noun) — A blemish resulting from a break without complete separation of the parts. ex. "there was a crack in the mirror"
crack (Noun) — A purified and potent form of cocaine that is smoked rather than snorted; highly addictive.
crack (Noun) — A usually brief attempt. ex. "he took a crack at it"
crack (Noun) — The act of cracking something.
crack (Noun) — A highly pleasurable or exciting experience.
crack (Noun) — (computing) a program, fake licence or procedure to circumvent software usage restrictions.
crack (Verb) — Become fractured; break or crack on the surface only. ex. "The glass cracked when it was heated"
crack (Verb) — Make a very sharp explosive sound. ex. "His gun cracked"
crack (Verb) — Make a sharp sound. ex. "his fingers cracked"
crack (Verb) — Hit forcefully; deal a hard blow, making a cracking noise. ex. "The teacher cracked him across the face with a ruler"
crack (Verb) — Pass through (a barrier). ex. "Registrations cracked through the 30,000 mark in the county"
crack (Verb) — Break partially but keep its integrity. ex. "The glass cracked"
crack (Verb) — Break suddenly and abruptly, as under tension. ex. "The pipe cracked"
crack (Verb) — Gain unauthorized access to computers with malicious intentions. ex. "she cracked my password" ex. "crack a safe"
crack (Verb) — Suffer a nervous breakdown.
crack (Verb) — Tell spontaneously. ex. "crack a joke"
crack (Verb) — Cause to become cracked. ex. "heat and light cracked the back of the leather chair"
crack (Verb) — (chemistry) reduce (petroleum) to a simpler compound by cracking.
crack (Verb) — (chemistry) break into simpler molecules by means of heat. ex. "The petroleum cracked"
crack (Verb) — (of a voice) change in pitch, esp. as a result of emotional strain.
crack (Verb) — Yield information under interrogation or torture. ex. "They managed to crack him on the third day"
crack (Verb) — Successfully decipher a code.
crack (Adjective) — Of the highest quality. ex. "a crack shot"