verb
cracks; cracked; cracking
to break (something) so that there are lines in its surface but it is usually not separated into pieces [+ obj]
[+ obj] :to hit or press (something) so hard that it breaks apart or opens suddenly
[+ obj] :to hit (someone or something) hard and usually suddenly
[+ obj] to open (a bottle or can) for drinking - usually + open
to open (a book) for studying or reading
usually + open
[+ obj] :to open (a safe) illegally without having a key, combination, etc.
[+ obj] to find an answer or solution to (something)
to find the meaning of (a secret code)
[+ obj] :to open (something, such as a door or window) a small amount - usually + open
to cause (something) to make a sudden loud sound [+ obj]
[no obj] of a voice :to change sharply in tone or pitch especially because of strong emotion
[+ obj] informal :to tell (a joke)
[no obj] :to lose strength or the ability to resist or fight
a tough/hard nut to crack
crack a smile
to smile
crack down
[phrasal verb]
to start to be strict about punishing people for doing something that is illegal or not allowed :to enforce a law or rule more strictly
crack into
[phrasal verb]
crack into (something) informal :to enter or get started in (something, such as a profession)
crack the whip
to force people to work very hard
crack up
[phrasal verb] informal
crack up or crack (someone) up or crack up (someone) :to begin laughing or cause (someone) to begin laughing suddenly and in a way that is difficult to control
to become mentally ill :to lose control of your thoughts and emotions so that you cannot continue to live in a normal way
crack up or crack up (something) also crack (something) up US informal :to damage (a vehicle) by crashing
Something that is what/all/everything (etc.) it's cracked up to be is as good as people say it is.
crack wise
US informal :to say something that is funny and smart :to make a wisecrack
get cracking
informal :to start doing something
noun
plural cracks
[count] :a thin line in the surface of something that is broken but not separated into pieces
[count] :a very narrow space or opening between two things or two parts of something
[count] :a sudden loud, sharp sound - usually singular
[count] :a brief change in the sound of a person's voice especially because of strong emotion - usually singular
[count] :a weakness or problem
[count] informal :a joke or rude remark - often + about
[count] :a hard and sudden hit - usually singular
[count] informal :an effort or attempt to do something - usually + at
[noncount] :an illegal drug that is a form of cocaine
a fair crack of the whip
Brit informal
If you are given a fair crack of the whip, you are given the same chance as other people to do something.
at the crack of dawn
very early in the morning :at dawn
fall through/between the cracks
also slip through/between the cracks
to fail to be noticed or included with others
adjective
always used before a noun
very good :of excellent quality or ability