< Brief Notes on"Kire-ji" >
This one is so popular that you never fail to know about it in your study of haiku.
"Ya" that follows "furu-ike" is called "kire-ji" or "cutoff word" and plays an extremely important role in this haiku: "ya" delivers a clear image of an old pond deserted in a gloomy winter field and spares wordy description.
Let me explain a little more about hire-ji. "Ya", "kana", "keri", or "nari" and other kire-ji effectively add to the author's feeling in a short haiku or speak for omitted words. Kire-ji, in this respect. provides a structural support for haiku. While not a few in number, those without hire-ji still inherit the refined traditions and rhythm of hire-ji as modified over time. Examples are such works of haiku as are noted for refined sharpness. Haiku that values omission alway seeks perfection by use of Kire-ji or its concept, I think.
Please note an established rule that kire-ji is used just once in a haiku. Two kire-ji might blur the message of a short poem of 17 syllables.