Expressions (phrases, clauses, etc.), Godan verb with 'su' ending
to pour water (into); to dilute with water
人の話に水を差さないでくれ。Don't throw a wet blanket over our conversation. to hinder; to hamper; to throw cold water on; to put a damper on; to estrange (people)
Idiomatic expression
Also written 水をさす【みずをさす】、水を注す【みずをさす】、水を刺す【みずをさす】