排水|はいすいhaisui[0]heiban (flat)

JLPT N1approx.Common
Definitions
  1. noun, suru verb, transitive verb, intransitive verbdrainage; draining; pumping out (water); sewerage
    学校がっこうはプールの水みずを月つき一回いちかい排水はいすいする。↗
    The school drains the pool once a month.
  2. noun, suru verb, transitive verb, intransitive verbdisplacement
Conjugation
Dictionary form排水する(はいすいする)
Polite (masu)排水します(はいすいします)
Negative (nai)排水しない(はいすいしない)
polite (masen)排水しません(はいすいしません)
classical zu / nu排水せず・排水せぬ(はいすいせず・はいすいせぬ)
Past (ta)排水した(はいすいした)
polite (mashita)排水しました(はいすいしました)
Past negative (nakatta)排水しなかった(はいすいしなかった)
polite (masen deshita)排水しませんでした(はいすいしませんでした)
Te form排水して(はいすいして)
Potential排水できる(はいすいできる)
Passive排水される(はいすいされる)
Causative排水させる(はいすいさせる)
Causative passive排水させられる(はいすいさせられる)
Conditional (ba)排水すれば(はいすいすれば)
tara排水したら(はいすいしたら)
Volitional排水しよう(はいすいしよう)
polite (mashou)排水しましょう(はいすいしましょう)
Imperative排水しろ(はいすいしろ)

Common forms generated by rule; see the senses for honorific or irregular usage.

Synonyms & antonyms
  • Synonym水抜きみずぬきNeutralA noun for emptying pipes of water or a drain hole (「冬季の水抜き」), often for winterizing home plumbing; 「排水」 is the general term for draining off water or sewage.
  • Related流すながすNeutralA verb meaning to let water flow or wash something away (「水を流す」「トイレを流す」); works in both speech and writing. 「排水」 centers on draining off standing water or sewage.
  • Antonym給水きゅうすいNeutralWater supply (「給水車」「給水制限」); the opposite of 「排水」, which sends water out.
  • Antonym注水ちゅうすいNeutralPouring or filling in water (「タンクに注水する」); the opposite of 「排水」.

Use 「排水」 for draining off unwanted standing water or sewage (「排水溝」「排水管」); it also covers a ship's displacement (「排水量」). For emptying pipes, say 「水抜き」; in everyday speech for washing water away, 「流す」. The opposite is 「給水」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

Japanese definitions
  1. 内部ないぶにある不要ふような水みずを外部がいぶへ排出はいしゅつすること。
  2. 水上すいじょうに浮うかんだ船舶せんぱくなどが、その重量じゅうりょうで水みずを押し退おしのけること。
Kanji in this word
English equivalents
See also

JLPT vocabulary levels are community estimates, not official (no official lists have been published since the 2010 revision).

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