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on the blink not functioning; needing repair.
on the carpet being reprimanded or closely questioned by someone in authority, such as one's employer.
on the contrary in contradiction to something already said.
on the dot (informal) exactly on time; punctually.
on the double (informal) right away; immediately.
on the downgrade losing rank, status, position, or wealth; declining.
on the house free, as a gift from a business establishment.
on the mend getting better, esp. in health; recuperating.
on the nose exactly.
on the off chance with the very slight likelihood; against the faint hope.
on the pad (slang) of a policeman, accepting a share of graft payments.
on the q.t. (informal) in stealth or secret; quietly.
on the qui vive on the lookout; alert; watchful.
on the rebound just after the bounce of a ball or the like. [2 definitions]
on the road traveling, esp. as a salesperson, performer, or theatrical company.
on the rocks in a state of financial ruin. [2 definitions]
on the shelf inactive or unused; put aside; reserved for future use or consideration.
on the sly secretly; stealthily.
on the spot at once; immediately. [2 definitions]
on the spur of the moment without much thought; on a sudden impulse.
on the upgrade improving, rising, or gaining importance.