swear like a sailor(redirected from swears like a sailor)
swear like a sailor
To use profanities or vulgar language very freely and fluently. (An allusion to the rough language presumed to be used by military personnel.) My little sister has been swearing like a sailor ever since she started learning bad words. My granny is the sweetest old lady you'll ever meet, but she swears like a sailor when she gets on the topic of something or someone she doesn't like.