As a noun: a tomato-based condiment (variant spelling of ketchup); as a verb: to catch up, to reach the same level or pace as someone else.
As condiment: from Chinese 'ke-tsiap' (salty fish sauce), adopted into English in 17th century. As verb: from 'catch' + 'up,' meaning to overtake. The two meanings represent homonyms that developed separately.
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