drop in the pond

a short drop and a sudden stop

A fall to one's death by hanging.

big fish in a small pond

One who has achieved a high rank or is highly esteemed, but only in a small, relatively unimportant, or little known location or organization.

don't drop the soap

Used as a mockery to someone who is about to be or should be confined in prison.

drop a bollock

To make a mistake.

drop a bomb

Alternative form of drop a bombshell.

drop a bombshell

To announce surprising or alarming information suddenly and without warning.

drop a brick

To commit a faux pas, especially in speech, such as by tactlessly speaking of a subject that should not be mentioned.

drop a dime

To make a telephone call.