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door opener

noun
1.
a mechanism that automatically opens a door, as of a garage, when actuated by a radio transmitter, electric eye, or other device.
2.
Informal. something that is effective in leading to opportunity or success:
Sales experience can be a door opener for young executives.
Also, door-opener.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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