ぬるめる

ぬ

る

め

る

Meanings

1

ichidan verb, transitive verb

cool down; make lukewarm

usually written using kana alone

Used for cooling hot water, typically by adding cold water or letting it stand, to make it lukewarm. Often used in cooking or bathing contexts.

風ふ呂ろの湯ゆが熱あつすぎたので、ぬるめて入はいった。

The bathwater was too hot, so I cooled it down before getting in.

冷さます
冷ます means to cool something down, often to room temperature or cold, while ぬるめる specifically means to make something lukewarm, usually from a hot state.
温あたためる
温める (あたためる) means to warm something up, the opposite action of ぬるめる. The kanji 温める can be read either way, but ぬるめる is rare.

Derived from the adjective ぬるい (lukewarm) with the verbalizing suffix める, meaning 'to make lukewarm'.