Noun
The control mechanism by which a door is latched and unlatched.
Any of various devices designed to make opening a door easier.
Any of various devices to automatically open a door in response to a sensor or signal sent from a controller.
(firefighting) A crowbar-like tool used by firefighters to quickly force locked doors to open.
Someone who opens doors.
Any tactic, approach, or giveaway item employed by a salesman to capture the interest of a potential customer.
A communication technique designed to encourage someone to speak openly.
Someone or something that provides someone with opportunities that would otherwise be unavailable to them.
Source: en.wiktionary.orgI would never say that being Bob Marley's son has been a pressure. It has been a door opener. Damian Marley
I got a garage door opener. It can't close. Just open. Steven Wright
Asking oneself if Christ is present in a refugee stuck in a camp or in a child who is starving “is the door opener to a fulfilled life. Source: Internet
Vibration emanating from a garage door opener often results in annoying rattle and clanging as the door opens and closes. Source: Internet
Remember If you have to park in the driveway or in a parking lot, please lock your car, take your keys, garage door opener, and valuables and don’t leave anything in plain view. Source: Internet
Garage Door Repair Pro's Phoenix, a chief garage door services provider, has now come up with garage door opener remotes. Source: Internet