Nounhack; inferior horse · inferior person; incapable person

Expressions (phrases, clauses, etc.), Godan verb with 'tsu' endingto work hard; to keep one's nose to the grindstone; to whip a jaded horse · to make someone do what is beyond their ability

Expressions (phrases, clauses, etc.), Godan verb with 'ru' endingeven an outstanding person becomes inferior when getting old