disuse (n.)

"cessation of use or practice," c. 1400, see dis- + use (n.). Disusage is from mid-15c.

c. 1400, disusen, "to misuse, pervert;" mid-15c., "become unaccustomed" (both senses now obsolete), from or on analogy of Old French desuser, from des- "not" (see dis-) + user "use" (see use (v.)). Meaning "cease to use, neglect to employ" is from late 15c.