lit. like a square peg in a round hole; to be mutually incompatible or a poor fit

a round socket and a square tenon do not fit together; used to describe people or things that are incompatible or at odds with one another

incompatible; ill-fitting; like trying to fit a square peg in a round hole

(literary) Mortise and tenon; used to describe two things that fit together perfectly or are compatible.

A round socket and a square tenon do not fit together; describes people or things that are incompatible or ill-suited to each other.

to be incompatible or a poor fit; refers to a square peg and a round hole that do not match

(literary) incompatible or at variance; like a square peg in a round hole; often used as an abbreviation for [[方枘圆凿|方枘圓鑿|fang1 rui4 yuan2 zao2]]