yoo-hoo

"to hide, conceal," going back to Old French cachier, quaichier "to put away, lock up, cover, remove from view, conceal" (also Middle French cacher "to press, crush"), going back to Vulgar Latin *coācticāre "to press, constrict," from Latin coāctāre "to compel" (frequentative of cōgere "to drive together, collect, compress, compel") + -icāre, verb formative — more at cogent

NOTE: The etymological sense "to compress, constrict" is not attested for the Old French verb, though it likely existed and is apparent in the prefixed form escachier "to crush and flatten, break by pressing or falling on." From the sense "compress" presumably developed the senses "lock up, cover, put away," and hence "remove from view, conceal," common from the sixteenth century. The sense "to press, crush" is marginally evident in Middle French in areas in contact with Occitan, though it penetrated widely enough to form the basis for the derivative cachet "seal" (see cachet).

verbal derivative of cache entry 1