in golf, 1721, back-formation from teaz (1673), taken as a plural; a Scottish word of uncertain origin. The original form was a little heap of sand. The verb meaning "place a ball on a golf tee" is recorded from 1673; fig. sense of "to make ready" (usually with up) is recorded from 1938. Teed off in the fig. sense of "angry, annoyed" is first recorded 1953, probably as a euphemism for p(iss)ed off.
tool, operating system A Unix command which copies its standard input to its standard output (like cat) but also to a file given as its argument. tee is thus useful in pipelines of Unix commands (see plumbing) where it allows you to create a duplicate copy of the data stream. E.g. egrep Unix Dictionary | tee /dev/tty | wc -l searches for lines containing the string "Unix" in the file "Dictionary", prints them to the terminal (/dev/tty) and counts them. Unix manual page: tee(1). [Jargon File] (1996-01-22)