in-off adverb 1noun 1forms 1 adverb1 •Of the cue ball: (going) into a pocket, after cannoning another ball.Hendry replied with 34, but went in-off attempting a double and next season's world No.1 returned to the table to put the frame beyond doubt and level at 4-4. — 2008 noun1 •The situation where the cue ball goes into a pocket after striking the object ball.He looked set to win the frame, until the in-off from the yellow. formsin-offs