Meaning of “rent-a-” in the English Dictionary

british dictionary

"rent-a-" in British English

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rent-a-prefix

uk /ren.tə-/ us /ren.t̬ə-/ UK disapproving

used when a person, thing, or group of people seems to have been rented for a particular purpose and is not sincere:

Most of the people on the protest seemed to be rent-a-mob, not real supporters.
humorous Old rent-a-quote is always turning up on TV to give his opinions.

(Definition of “rent-a-” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)