get one's foot in the door
Means: If you get your foot in the door, it means that you have the opportunity to get started at a job or in a company or in an organization, where your goal is to eventually have a bigger job. you usually get your foot in the door by starting part-time or with an internship, or just by having connection knowing the right people.
Examples:
I really wanted to work in that company, but I was unable to get the position I wanted. I decided to apply for and accept a lower position to get my foot in the door.
She's doing an intership in this company and it's a great opportunity to get her foot in the door.
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