Meaning of “make a (big) difference” in the English Dictionary

american-english dictionary

"make a (big) difference" in American English

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make a (big) difference

also make all the difference

to improve a situation or condition in an important way:

He's much happier now – his new school seems to have made a big difference.

(Definition of “make a (big) difference” from the Cambridge Academic Content Dictionary © Cambridge University Press)