Get off (one's) case spoken language informal verb phrase
To stop continuously bothering or criticizing someone for what they have done
Get off my case! I'm in a hurry.
I'm trying my best. Get off my case!
The verb "get" should be conjugated according to its tense.
To punish someone or something harshly
He's a really strict teacher, so he'll definitely lower the boom on you if you don't do your homework.