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door opener

or door-opener

a mechanism that automatically opens a door, as of a garage, when actuated by a radio transmitter, electric eye, or other device.
Informal. something that is effective in leading to opportunity or success:
Sales experience can be a door opener for young executives. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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Examples from the Web for door-opener
Historical Examples
  • There was a sort of door-opener or verger at the entrance, and I said to him: "What is the meaning of all this?"

    A Book of Ghosts Sabine Baring-Gould
  • His habit of entering houses for this purpose, uninvited, earned him the nickname Θυρεπανοίκτης (“door-opener”).

  • An Austrian officer is gaudier than the door-opener of a London cafe or the porter of a Paris hotel.

    Europe Revised Irvin S. Cobb

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