Letup is a 5 letter English word. It's valid Scrabble word worth 7 points. It's valid Words with friends word worth 10 points.
You can make 50 anagrams from letters in letup (elptu).
1835-45, Americanism; noun use of verb phrase let up
There is no letup until the bright sun drives vice blinking and blinded back into its holes.
Then continue to stir in the same direction without an instant's letup, for maybe ten minutes or more, until the Rabbit is smooth.