Being confined to a corner means restriction, and "Yu" is a preposition indicating a place, which can be interpreted as "yes", and "corner" refers to a corner. The literal meaning of this word is "confined to a small scope", and now it is often used to mean that someone's thinking can't keep up with the pace of the times, his thinking is rigid, and his communication with people can't keep up with the development of the times.

Deviating from one side means emphasizing one aspect. It can also be understood as incomplete.