expression, godan verb (-ru, irregular)
have a point; have some truth; make some sense
Used when acknowledging that someone's argument or opinion has at least some validity, even if you do not fully agree. Often appears as 一理あると思う or 一理あると言える.
彼の意見にも一理あると思う。
I think his opinion has a point, too.
確かに、君の言うことには一理ある。
Certainly, there is some truth in what you say.
From 一理 (one reason, some truth) + ある (to exist). The phrase literally means 'there is one reason/truth,' and is used idiomatically to acknowledge partial validity.