Main Entry:  push-to-talk
Part of Speech:  n
Definition:  a method of communicating on half-duplex lines, as two-way radio, using a button to switch modes from voice reception to transmission; abbr. PTT
Example:  PTT is a two-way communication service that works like a "walkie talkie."
Etymology:  1947
Usage:  also push-to-talk, (adj.)
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