Nouns

(n)dumbbell, dummy, dope, boob, booby, pinheadan ignorant or foolish person
(n)breast, bosom, knocker, boob, tit, tittyeither of two soft fleshy milk-secreting glandular organs on the chest of a woman

Verbs

(v)drop the ball, sin, blunder, boob, goofcommit a faux pas or a fault or make a serious mistake“I blundered during the job interview”