What is the meaning of "fit to burst" in this sentence? Is this an idiom?
I've eaten so much I'm fit to burst.

As far as I know, "fit to burst" means "very much" which doesn't fit in this context; I suppose.

Thank you in advance!

Question

What is the meaning of "fit to burst" in this sentence? Is this an idiom?
I've eaten so much I'm fit to burst.

As far as I know, "fit to burst" means "very much" which doesn't fit in this context; I suppose.

Thank you in advance!

Answer

It is idiom - but its meaning is pretty straight-forward (although exaggerated!)
'Fit' here means ready. Ready to burst means so full that you feel like you are going to explode.
It could also be used for (say) a radiator hose in a car that has started to split.

Answer

"To be fit to (verb)" means you are ready to, or about to do something. It doesn't have a common use nowadays, apart from in expressions such as "fit to burst".

You've eaten so much that you think you might burst, like a balloon.

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