Drop it

'Drop it' is something you say to end the topic of a conversation. Said as a direct command, it's most likely to be said by a parent to a child. Where the power relationship is closer, it is often asked, 'Can't we please just drop it?'

Examples:
-Mom, please can we stay up until 10? It's Saturday...!
-I've already said no, so drop it.

-Your aunt drives me crazy!
-I know. I'm sorry.
-I mean, she's always...
-Can't we please just drop it? We're almost to her house and I'm sure she's made a nice dinner for us!