Why the phrase "foot the bill" means "to be responsible for paying the cost of sth"?

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Why the phrase "foot the bill" means "to be responsible for paying the cost of sth"?

The phrase "foot the bill" means to be responsible for paying the cost of something because the word "foot" is used in the sense of "to bear the burden of" or "to take responsibility for."

The origin of this phrase is not entirely clear, but it is believed to have originated in the 18th century. One theory is that it comes from the idea of "footing" a bill, which means to add up the total cost of something and then divide it among the people who are responsible for paying it. Another theory is that it comes from the idea of "footing" a horse, which means to pay for its care and feeding.

Regardless of its origin, "foot the bill" has come to mean taking responsibility for paying the cost of something, and it is a common phrase used in everyday conversation.