Roughly 2.54 centimeters (4)

I believe the answer is:

inch

(Other definitions for inch that I've seen before include "Move by small amounts" , "Creep - a very short distance" , "2.45 cm" , "Creep, edge" , "One point 63380 th of a mile" .)

I've seen this clue in the USA Today and the Universal.

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