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Old English tol "instrument, implement," from Proto-Germanic *tolan (cf. Old Norse tol), from a verb stem represented by Old English tawian "prepare." The ending is the instrumental suffix -l (e.g. shovel). Figurative sense of "person used by another for his own ends" is recorded from 1660s. Slang meaning "penis" first recorded 1550s.
"to drive a vehicle," 1812, probably from tool (n.). The meaning "to work or shape with a tool" is recorded from 1815; that of "equip (a factory) with machine tools" is from 1927. Related: Tooled; tooling.
Very delicate or explosive; very controversial: The March was rejected by PBS as ''not suitable to their programming'' (nobody actually said it was too hot to handle)
[1940s+; found in baseball by 1932, designating a very hard-hit ball]