You Collection, Upper Volume
Radical: Speech (yán)
Page 1180, Entry 22
Pronounced ying (falling tone).
Shuowen Jiezi (Shuowen): To answer with words.
Also pronounced ying.
Yupian: To respond.
Leipian: To answer words.
Zengyun: To use words to reply to an inquiry.
Su Shi, Poem in Remembrance of Ziyou: From afar I know that while you read the Book of Changes (Yijing) beneath the western window, the sound of carriages and horses knocking at the door will certainly not receive a response.
Also, in the Rhyme Collection (Yunhui), it is commonly written as the variant form (ying).
Li Mi, Memorial on Feelings (Qingbiao): Within, there is no five-foot child to answer the door.
Shuowen Jiezi (Shuowen): Originally written as the variant form.
Jiyun: Sometimes written as the variant form (ying).