Third person singular present tense of 'foot'; means to pay for something (as in 'foots the bill') or to walk/travel on foot.
From Old English 'fōt' as a verb. The phrase 'foot the bill' emerged in the 16th century from the idea of putting your signature (foot) to a document as approval.
'Footing the bill' originally meant literally signing a bill with your mark—the foot/footprint as a signature—which evolved into meaning to pay for or take responsibility for something.
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