to stop.

The action and special effects never let up long enough for you to realize how stupid the movie actually is.

Usage notes: often used in the form not let up:

The heat didn't let up until the weekend.

• go off on a tangent
• go off rocker
• go off the boil
• go off the deep end
• go off the rails
• go off trolley
• go off your rocker
• go off your trolley
• goof off
• goof on
• goof on someone
• go one better
• go one better than
• go one better than someone
• go one better than something
• go on record
• go on the game
• go on the piss
• go on the razzle
• go on the wagon
• go out like a light
• go out of the window
• go out of way
• go out of way to
• go out of way to do something