bats

About 2.12 uses per million words.

Meaning

1. noun plural of bat
2. verb third-person singular simple present indicative of bat
3. adjective Mad, insane.

   You must be bats to go out in the cold without a coat on.

Similar words

bonkers batty loony insane dotty barmy kooky wacky daft nuts

Often followed by

and are in were of have that to or