a short drop and a sudden stop

a day late and a dollar short

Too late and too feeble to achieve the desired effect.

caught short

unprepared or without enough of something when it is needed

couldn't stop a pig in a passage

To be bow-legged.

don't drop the soap

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

down to the short strokes

In the final steps or decisive phase of an undertaking, especially one which has been lengthy or laborious.

draw the short straw

To be selected to do an undesirable task (by drawing the shortest straw or otherwise).

drop a bollock

To make a mistake.

drop a bomb

Alternative form of drop a bombshell.