To Throw Away, To Abandon
transitive verb, ichidan verb
Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means throw away so the verb version is to throw away.
すてる
The reading is the one you learned with the kanji, so no need to throw away that bit of knowledge just yet!
私の主人は、たとえ一日でも賞味期限が過ぎていたら捨てるんですよ。
My husband throws away food that’s past its freshness date, even if it was only by one day.