What does "boot" mean?

See boot in WNW Idioms

bet your boots

☆
Informal to be certain; rely on it

die with one's boots on

to die in action

lick the boots of

☆
to be servile toward; fawn on

the boot

Slang discharge, as from work; dismissal

to boot

besides; in addition

See boot in American Heritage Dictionary 4 Idioms

to boot

In addition; besides: Not only was the new cruise ship the biggest in the world, but the fastest to boot.

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