Meaning of “all of sth” in the English Dictionary

british dictionary

"all of sth" in British English

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all of sth

used to emphasize the amount or number of something, usually when something is small in a disappointing or unusual way:

In the last two years the book has sold all of 200 copies.

(Definition of “all of sth” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)