someone or something that could change a situation in a way that you do not expect.

The independent candidate is the joker in the pack in this election.

• to have the hots for someone
• to heart's content
• to hell with
• to hell with someone
• to hell with something
• toing and froing
• toll the death knell
• to make a long story short
• Tom, Dick and Harry
• Tom, Dick or Harry
• Tomorrow's another day.
• to my mind
• tone down
• tone down something
• tongue in cheek
• tongue-in-cheek
• tongue-lashing
• to no avail
• too bad
• too big for boots
• too big for your boots
• too close for comfort
• too close to call
• too for words
• too good to be true