用ひる

Etymology
First attested in texts around the, persisting until around the in the 1920s.

The attestable root verb is, itself a compound (see that entry for details). During the mid-, medial sounds shifted to, leading to confusion between mid-word  and. The hiragana spelling was then reinterpreted as a conjugation of base verb, which appears as a back-formation. Later during the and  periods, sound changes reduced medial  still further, such that  merged into. The resulting shift in the verb ending from -wiru to -iru was reinterpreted again as a conjugation of base form, which again appears as a back-formation.

Verb

 * : to use
 * 1) * 1940s,, Pillow up in the floating clouds (text here)
 * 2) * 1946, The Constitution of Japan, Article 29:
 * 1) * 1946, The Constitution of Japan, Article 29: