On The

• on the alert • on the average • on the ball • on the beam • on the brink • on the button • on the coattails • on the contrary • on the dot • on the double • on the face of it • on the far side • on the fence • on the fly • on the fritz • on the go • on the hook • on the house • on the job • on the level • on the lookout • on the lookout for • on the loose • on the move • on the nose • on the offensive • on the one hand • on the other hand • on the q.t. • on the qt • on the qui vive • on the rag • on the road • on the rocks • on the run • on the shelf • on the side • on the sly • on the spot • on the spur of the moment • on the table • on the verge • on the wagon • on the wane • on the way • on the whole • on the wing