The teacher decided to crack down on the students.
So she cracked open the toolbox and cracked the whip.
The students all cracked up…
laughing.
crack
The windows what not they were cracked up to be.
So they cracked down on the viruses.
They cracked out the penguins.
The windows sellers all crack up.
The penguin users had a cracking good time.
Tux;-)
Phrasal Verbs - By Example 