背負う

Etymology 1
Compound of.

First cited in the early 1200s.

Verb

 * 1)  to be burdened with, to carry on back or shoulder

Etymology 2
Phonological shift from,    as the  sound was formerly pronounced more like , as recorded in the  of 1603. This Japanese-Portuguese dictionary transcribes all instances of using the then-current Portuguese orthography of, where the  spelling indicated w:Voiceless postalveolar fricative, similar to the initial consonant sound in.



This reading is first attested in a text from 1278.

Verb

 * 1)  to be burdened with, to carry on back or shoulder