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Etymology 1
From classical, by a shift in the conjugation from ichidan to godan.

Verb

 * 1)  to give
 * 2)  to do something for me/us
 * 1)  to do something for me/us

Usage notes

 * The receiver is always the speaker or someone close to the speaker such as a family member. The giver is always someone of higher social status than the speaker.

Etymology 2
Derived as the passive / potential / spontaneous / honorific conjugation of.

Verb

 * 1)  to give
 * 2)  to do something for me/us