From there we see Biden start to crack up—perhaps caught off guard by the unexpected compliment.
Part of you wants to call an ambulance; part of you wants to run away; and part of you wants to crack up.
After hours of this—literally—men begin to crack up, and a class of 100 can shrink by 10 percent in a few minutes.
They're all at the same scribbling business themselves; o' course they'd crack up one another.'
But there she is, and I could crack up this old world to know what's coming.
Could you go round to your old neighbours and crack up our goods, and book their orders and that sort of thing?
I was looking out at the McKenzies from a crack up in the house.
The Wreckers had some method of attracting ships to crack up on their reefs.
Maybe she had a right to crack up a saucer or two in that restaurant.
Instead of coming back here to crack up I went across the lake and landed in a meadow.
"split, opening," 14c., from crack (v.). Meaning "try, attempt" first attested 1836, probably a hunting metaphor, from slang sense of "fire a gun." Meaning "rock cocaine" is first attested 1985. The superstition that it is bad luck to step on sidewalk cracks has been traced to c.1890. Adjectival meaning in "top-notch, superior" is slang from 1793 (e.g. a crack shot).
[all senses are ultimately echoic; narcotics sense fr the sound of breaking crystals or the cracking sound the crystals make when smoked]