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section (i.e. of text); sentence; passage; paragraph
phrase
verse (of 5 or 7 mora in Japanese poetry; of 4, 5, or 7 characters in Chinese poetry)
haiku; first 17 morae of a renga, etc.
maxim; saying; idiom; expression
clause (e.g. in a database query language)
名言の句を覚えておくといいよ。
It's good to memorize famous phrases.
この句の意味を説明してください。
Please explain the meaning of this phrase.
俳句を作るのは難しいと思う。
I think making haiku is difficult.