あいだる

nidan verb (lower class) with 'ru' ending (archaic), intransitive verb

behave like a spoilt child

Archaic intransitive Nidan verb. The modern equivalent is 甘える (sense 1).

See also: 甘える

• 古こ語ごでは「あいだる」と書かいて、甘あまえることを表あらわした。

  In classical Japanese, 'aidaru' was written and meant to behave like a spoilt child.