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door opener

or door-opener

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noun
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.
QUIZ
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Question 1 of 7
Fill in the blank: I can’t figure out _____ gave me this gift.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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