godan verb (-ru), intransitive verb
Describes a physical shape that is square or angular, often with a sense of being rigid or boxy.
この机は四角張っていて、角が痛い。
This desk is square and its corners hurt.
godan verb (-ru), intransitive verb
Used for a person's attitude, speech, or atmosphere that is overly formal, rigid, or lacking warmth.
彼は初対面の人には四角張った話し方をする。
He speaks stiffly with people he meets for the first time.
四角張らないで、気楽に話してください。
Please don't be so formal; talk freely.