English Explanatory Dictionary

act one's age, not one's shoe size

English dictionary entry

Meanings

verb
  1. Synonym of act one's age (“to behave in a mature manner; to avoid being childish”).

Word forms

act one's age, not one's shoe size acts one's age, not one's shoe size acting one's age, not one's shoe size acted one's age, not one's shoe size

Etymology

In reference to a person's shoe size (in the US or UK shoe size systems) usually being much lower than their age.

Synonyms

act one's age
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