A British phrase meaning to do something wholeheartedly, with total enthusiasm, or to be so full of a feeling you can barely contain it. You can be fit to burst with pride, love, excitement, or even laughter. It's a brilliantly expressive idiom — that physical sense of being so packed with emotion you might literally pop. Hugely common in UK everyday speech, totally natural across ages, and used in both casual conversation and writing.
When her daughter crossed the finish line first, she was fit to burst with pride.
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(informal, chiefly, UK) Wholeheartedly.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.