off one's game

1. adjective

a) Playing or competing below ones 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 ones pills.

b) Performing in any activity below ones usual level; behaving in an irregular, inept, or awkward manner; feeling unwell.

Big Bertha, the crowd-pleasing sand tiger shark who survived an astonishing four decades at the New York Aquarium, has died. "She was off her game. She slowed down. She wasnt quite right," said Hans Walters, the animal department supervisor.

2. adverb

a) In or into a condition of competing below a usual level of performance.

Then the latter, as every golfer does at times, suddenly went right off his game.

b) In or into a condition which reflects unaccustomed poor performance or unwellness in an activity or situation.

Adam found himself answering the viewers questions while also trying to cook—which threw him off his game.