Meaning

• A thin and usually jagged space opened in a previously solid material.

  "A large crack had formed in the roadway."

• A narrow opening.

  "Open the door a crack."

• A sharply humorous comment; a wisecrack.

  "I didn't appreciate that crack about my hairstyle."

• Crack cocaine, a potent, relatively cheap, addictive variety of cocaine; often a rock, usually smoked through a crack-pipe.

  "crack head"

• The sharp sound made when solid material breaks.

  "The crack of the falling branch could be heard for miles."

• Any sharp sound.

  "The crack of the bat hitting the ball."

• A sharp, resounding blow.

• An attempt at something.

  "I'd like to take a crack at that game."

• Vagina.

  "I'm so horny even the crack of dawn isn't safe!"

• The space between the buttocks.

  "Pull up your pants! Your crack is showing."

• Conviviality; fun; good conversation, chat, gossip, or humorous storytelling; good company.

  "He/she is quare good crack."

• Business; events; news.

  "What's the crack?"

• A program or procedure designed to circumvent restrictions or usage limits on software.

  "Has anyone got a crack for DocumentWriter 3.0?"

• (elsewhere throughout the North of the UK) a meaningful chat.

• Extremely silly, absurd or off-the-wall ideas or prose.

• The tone of voice when changed at puberty.

• A mental flaw; a touch of craziness; partial insanity.

  "He has a crack."

• A crazy or crack-brained person.

• A boast; boasting.

• Breach of chastity.

• A boy, generally a pert, lively boy.

• A brief time; an instant; a jiffy.

  "I'll be with you in a crack."

Meaning

• To form cracks.

  "It's been so dry, the ground is starting to crack."

• To break apart under pressure.

  "When I tried to stand on the chair, it cracked."

• To become debilitated by psychological pressure.

  "Anyone would crack after being hounded like that."

• To break down or yield, especially under interrogation or torture.

  "When we showed him the pictures of the murder scene, he cracked."

• To make a cracking sound.

  "The bat cracked with authority and the ball went for six."

• (of a voice) To change rapidly in register.

  "His voice cracked with emotion."

• (of a pubescent boy's voice) To alternate between high and low register in the process of eventually lowering.

  "His voice finally cracked when he was fourteen."

• To make a sharply humorous comment.

  ""I would too, with a face like that," she cracked."

• To make a crack or cracks in.

  "The ball cracked the window."

• To break open or crush to small pieces by impact or stress.

  "You'll need a hammer to crack a black walnut."

• To strike forcefully.

  "She cracked him over the head with her handbag."

• To open slightly.

  "Could you please crack the window?"

• To cause to yield under interrogation or other pressure. (Figurative)

  "They managed to crack him on the third day."

• To solve a difficult problem. (Figurative, from cracking a nut.)

  "I've finally cracked it, and of course the answer is obvious in hindsight."

• To overcome a security system or a component.

  "It took a minute to crack the lock, three minutes to crack the security system, and about twenty minutes to crack the safe."

• To cause to make a sharp sound.

  "to crack a whip"

• To tell (a joke).

  "The performance was fine until he cracked that dead baby joke."

• To break down (a complex molecule), especially with the application of heat: to pyrolyse.

  "Acetone is cracked to ketene and methane at 700°C."

• To circumvent software restrictions such as regional coding or time limits.

  "That software licence will expire tomorrow unless we can crack it."

• To open a canned beverage, or any packaged drink or food.

  "I'd love to crack open a beer."

• To brag, boast.

• To be ruined or impaired; to fail.