door opener
noun
1
: a device to open a door: such as
a
: a tool used by firefighters to jimmy a locked door
b
: a release mechanism attached to a door lock and activated by a pushbutton or electric eye
2
: an inexpensive gift or premium offered to a prospect by a door-to-door salesperson in order to enter the house and present a sales pitch
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Merriam-Webster unabridged
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