To Dilute
To Water Down, To Thin Something
transitive verb, ichidan verb
You've already learned one verb for this kanji: 薄まる (to be diluted). Well, this is its transitive sibling, so it means to dilute or to water down something. Here, you're the one actively thinning something down.
The reading comes from 薄い, so if you know that you'll be able to read this too.
この味噌汁はしょっぱすぎるよ。もうちょっと薄めてもらってもいいかな？
This miso soup is too salty. Can you water down a little bit?
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