Definitions
1.VerbTo laugh.
To laugh heartily."It was hilarious. We were cracking up the whole time.; The joke about the nuns in the bath cracked me up.; He's always cracking up at me about that."
2.VerbTo laugh heartily."It was hilarious. We were cracking up the whole time."
3.VerbTo cause to laugh heartily."The joke about the nuns in the bath cracked me up."
4.VerbTo tease (someone) or tell jokes at the expense of (someone)."He's always cracking up at me about that."
5.VerbTo break.
To become insane; to suffer a mental breakdown."She got through the war, but cracked up when her sister died.; The university was really cracking up, losing faculty, students and donors, and it seemed like to go under.; My motorcycle cracked up before I arrived.; I have to crack up that little clique.; We can send you a hundred pounds a month of pecans to crack up.; The refinery cracks up the heavier oils."
6.VerbTo become insane; to suffer a mental breakdown."She got through the war, but cracked up when her sister died."
7.VerbTo break down or fall apart; to stop functioning; to shatter."The university was really cracking up, losing faculty, students and donors, and it seemed like to go under.; My motorcycle cracked up before I arrived."
8.VerbTo separate a group."I have to crack up that little clique."
9.VerbTo crash an aircraft or automobile.
10.VerbTo remove the shell from nuts."We can send you a hundred pounds a month of pecans to crack up."
11.VerbTo crack (petroleum). (to break down (a complex molecule), especially with the application of heat: to pyrolyse)"The refinery cracks up the heavier oils."
12.VerbTo affect the image of something.
To praise or applaud (something); to promote a positive view of (something)."She wasn't as impressive as Katie cracked her up.; Those who have been cracking up the agricultural industry will hopefully reconsider their denigration of it.; This new computer system is not what it was cracked up to be."
13.VerbTo praise or applaud (something); to promote a positive view of (something)."She wasn't as impressive as Katie cracked her up."
14.VerbTo insult, demean or harm the image of (something)."Those who have been cracking up the agricultural industry will hopefully reconsider their denigration of it."
15.VerbTo cry up; to extol."This new computer system is not what it was cracked up to be."
16.VerbTo smoke crack cocaine."I need to crack up."
17.AdjectiveFunny; hilarious"That joke was crack up."