Definition of hash key in English:

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hash key

noun

A button on a computer keyboard or telephone keypad that is marked with a # sign: pressing and holding the hash key activates silent/vibrate mode
More example sentences
  • It invites me to call his mobile "by pressing your hash key 17 times".
  • You had to wait for exactly 15 secs and press the hash key and you'd be connected straight away.
  • By pressing the hash key on your phone before you make a call, you automatically swap to this service.

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