Have a foot in the door - Idioms by The Free Dictionary
have a foot in the door
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have a/(one's) foot in the door
To have a chance to do something that could lead to further opportunities. The phrase is often used to refer to employment. An internship might not sound very interesting, but once you have a foot in the door, you could be considered for a better job in the company.
have (or get) a foot in the door have (or gain) a first introduction to a profession or organization.
get/have a/your ˌfoot in the ˈdoor start/have started to be accepted in an organization, a group, a profession, etc. that could bring you success: It’s difficult to get your foot in the door as a young actor without any experience. ▶ ˌfoot-in-the-ˈdoor adj.: aggressive, foot-in-the-door sales techniques