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"increase" is also used as a crossword clue. If that's what you saw, the answer is often boost (5 letters).
Definitions
Make or become bigger or more.
Word origin
From Middle English encresen, borrowed from Anglo-Norman encreistre, from Latin increscere (“to increase”), from in (“in, on”) + crescō (“grow”).
Used in a sentence
“His rage only increased when I told him of the lost money.”
“The waters increased and bare up the ark.”
“The heavens forbid / But that our loves and comforts should increase, / Even as our days do grow!”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Grow larger”8 letters
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