expression, godan verb (-ru)
Physical stiffness in the shoulders, often from tension or poor posture. Similar to 肩が凝る, but 肩が張る emphasizes a tight, stretched feeling rather than a dull ache.
See also: 肩が凝る
長時間のデスクワークで肩が張ってきた。
My shoulders have gotten stiff from long hours of desk work.
expression, godan verb (-ru)
Idiomatic use describing a psychological state of tension or discomfort, as if one's shoulders are physically tight. Often used in formal or unfamiliar social situations.
初対面の人ばかりで、どうも肩が張る。
With only people I'm meeting for the first time, I feel rather tense.