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"inchworm" is also used as a crossword clue. If that's what you saw, the answer is often looper (6 letters).
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Definitions
A looping caterpillar that moves by drawing its rear forward.
Word origin
From inch + worm. So called because their gradual movement seems to be measuring the ground; compare measuring worm.
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer0 curated clues
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