Meaning of “the thin end of the wedge” in the English Dictionary

british dictionary

"the thin end of the wedge" in British English

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the thin end of the wedge

UK

the beginning of a harmful development:

Identity cards for students could be the thin end of the wedge - soon everyone might have to carry identification.

(Definition of “the thin end of the wedge” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

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