crackとは何ですか?To break or snap apart.To make a sharp snapping sound.To break without complete separation of parts; fissure: The mirror cracked. To change sharply in pitch or timbre, as from hoarseness or emotion. Used of the voice.To break down; fail: The defendant's composure finally began to crack. To have a mental or physical breakdown: cracked under the pressure. To move or go rapidly: was cracking along at 70 miles an hour. Chemistry To break into simpler molecules by means of heat.To cause to make a sharp snapping sound.To cause to break without complete separation of parts: cracked the glass. To break with a sharp snapping sound. See Synonyms at break.To crush (corn or wheat, for example) into small pieces.To open to a slight extent: cracked the window to let in some air. To strike with a sudden sharp sound.Informal To break open or into: crack a safe. Informal To open up for use or consumption: crack a book; cracked a beer. Informal To break through (an obstacle) in order to win acceptance or acknowledgement: finally cracked the "men-only” rule at the club. To discover the solution to, especially after considerable effort: crack a code. To cause (the voice) to crack.Informal To tell (a joke), especially on impulse or in an effective manner.To cause to have a mental or physical breakdown.To impair or destroy: Their rude remarks cracked his equanimity. To reduce (petroleum) to simpler compounds by cracking.A sharp snapping sound, such as the report of a firearm.A partial split or break; a fissure.