noun
General term for a single phrase, line, or verse in poetry or song. Can refer to a memorable saying or a short poetic expression.
彼のスピーチには心に残る一句があった。
His speech had a memorable phrase.
noun
one haiku
Specifically refers to a single haiku poem. Often used when counting or presenting haiku.
一句詠んでください。
Please compose one haiku.
Compound of 一 (one) and 句 (phrase, clause, verse). The reading いっく follows regular sound change from いちく.