noun
Used when questioning whether someone has the right or justification to do something, often in negative or interrogative expressions like 筋合いはない (have no right) or そんな筋合いはない (you have no right to do that).
あなたにそんなことを言われる筋合いはない。
You have no right to say such a thing to me.
彼が怒る筋合いはないと思う。
I don't think he has any reason to be angry.
Compound of 筋 (すじ, 'line, logic, reason') and 合い (あい, 'mutual, together'). The combination conveys a sense of logical coherence or rightful claim.