pick pickseize on . seize on or upon {v. phr.} To latch onto. Whenever Herb is in a romantic mood, Irene seizes on it and starts talking about marriage, which is not what Herb had in mind. Categories: add yours add yours mood verb Source: A Dictionary of American Idioms Subscribe to: American Idioms► Also consider the parent subscriptions (1)English Slang Add my comment Add my comment