crack a smile

crack a crust

To make a living.

crack a fat

To get an erection of the penis.

crack down

To take harsh action (against), as when enforcing a law more stringently than before.

crack of dawn

The first moment of daylight; the instant at which sunrise begins.

crack through

To penetrate

crack up

To laugh.

employ a steam engine to crack a nut

To carry out a simple task in an overcomplicated manner.

fair crack of the whip

Let's have an equitable attempt, match, or process. Used as an appeal for reasonableness.