This is the 10015th most frequent Japanese word.
辞
"辞" means "word" or "to resign."
In this sentence, "辞" is used as a verb meaning "to resign or leave a position."
彼は重要な役職を辞した。
He resigned from an important position.
Here, "辞" appears in the form "辞による," meaning "by one's words or expressions." It highlights communication.
本人の辞によると、この辞書は役に立つ。
According to his own words, this dictionary is useful.
"辞する" in this context means "to discard or give up," showcasing its versatility in meaning beyond just resign.