Wd-40 Reduces This to Get Parts Moving Again

This page is the CodyCross answer for the clue below from Treasure Island, Group 1027, Puzzle 5 (X Marks the Spot).

Question is: Wd-40 Reduces This to Get Parts Moving Again

and the answer is: FRICTION

Word Meaning:

FRICTION — The rubbing of one object or surface against another.

Definitions from Wiktionary.