a foot in the door
The phrase "a foot in the door" refers to having an initial opportunity or advantage that allows someone to gain access or start a relationship in a certain field, industry, or organization. It can be used to describe a situation where a person is able to make a small entry or gain preliminary acceptance, with the potential to increase their influence or achieve further progress in the future.
An idiom is a phrase or expression that usually presents a figurative, non-literal meaning attached to the phrase. Does that sound fun? It can be!
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