The difference between By and large and For the most part
When used as adverbs, by and large means mostly, generally, whereas for the most part means mostly.
check bellow for the other definitions of By and large and For the most part
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By and large as an adverb (set phrase, focus):
mostly, generally; with few exceptions
Examples:
"It was, by and large, an unexceptional presentation."
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For the most part as an adverb (idiomatic):
Mostly; in general; usually
Examples:
"She talked about her kids, for the most part."