[tread water] {v. phr.} To keep the head above water with […]

[treat] See: [TRICK OR TREAT].

[tree] See: [BARK UP THE WRONG TREE], [CAN'T SEE THE WOOD […]

[Treeware] Hacker slang for documentation or other printed material.

[trembling] See: [FEAR AND TREMBLING].

[trial] See: [ON TRIAL].

[trial and error] {n.} A way of solving problems by trying […]

[trial balloon] {n.} A hint about a plan of action that […]

[trice] See: [IN A FLASH] also [IN A TRICE].

[trick] See: [DO THE TRICK], [TURN THE TRICK].