no no exclamation 2no-no noun 2forms 3 exclamation2 •Used to fervently deny something.No no, you got me all wrong! •Response to ahoy if no officer is in the boat. no-no noun2 •(informal) Something that is forbidden, prohibited, discouraged or taboo.Smoking indoors is becoming a real no-no these days, in many places. •(informal) A no-hitter; a game in which no batter on one of the teams got a hit.He threw two no-nos in his career. formsno nos · no-noes · no-nos
