avast (uh-VAST) interjection Stop (used as a command to stop or desist). [From Dutch hou vast (hold fast), from houd vast.] -Guest Wordsmith John (Ol' Chumbucket) Baur (chumbucketATtalklikeapirate.com) "The best part, though, is the music. It dips and swells in the game right along with the action.... Sign in to see full entry.