off one's game prepositional phrase2 •Playing or competing below one's usual level of performance.One fellow I knew once was off his game the whole first half because some idiot was flying a kite over the field advertising some one's pills. — 1910 •Performing in any activity below one's usual level; behaving in an irregular, inept, or awkward manner; feeling unwell.Adam found himself answering the viewer's questions while also trying to cook—which threw him off his game. — 2008
