関せきの山やま

expression, noun

the most one can do; the best one can expect

Idiomatic expression indicating that something is the absolute limit or the best possible outcome, often used with a nuance of resignation or modest expectation.

• 彼かれの英えい語ご力りょくは日にち常じょう会かい話わが関せきの山やまだ。

  At best, his English ability is limited to everyday conversation.