godan verb (-ku)
be charming; have a charming face/voice/personality
Describes a person or their attributes as naturally charming or endearing. Often used for an innate, effortless appeal.
彼女は笑うと愛敬付く。
She becomes charming when she smiles.
あの子は声に愛敬付いている。
That child has a charming voice.
Compound of 愛敬 (charm, amiability) + 付く (to attach, to be endowed with). The exact historical derivation is uncertain, but the word likely developed from the idea of charm 'attaching' to a person.