Definition of “what's more” - English Dictionary

british dictionary

“what's more” in British English

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what's more

B2 used to add something surprising or interesting to what you have just said:

The decorations were absolutely beautiful and what's more, the children had made them themselves.

(Definition of “what's more” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“what’s more” in American English

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what’s more

more importantly:

The decorations were beautiful and, what’s more, the kids made them themselves.

(Definition of “what’s more” from the Cambridge Academic Content Dictionary © Cambridge University Press)