Actually, good question....
Oh, here's a possibility of where it came from from Wiktionary...
Wiktionary wrote:
There are many theories as to where this idiom comes from, but a plausible one is as follows:
A person standing on a pail or bucket with her head in a slip noose would kick the bucket so as to commit suicide;
Although it means "to kick the bucket" means to die past tense, I meant he is dying.
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(No longer a mod)
On sabbatical...