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Phrase(s): get one’s foot in the door
Fig. to complete the first step in a process. (Alludes to people selling things from door-to-door and blocking the door with a foot so it cannot be closed on them.) • I think I could get the job if I could only get my foot in the door. • It pays to get your foot in the door. Try to get an appointment with the boss.
McGrawhill's American Idioms And Phrasal Verbs