To Rub
To Scrub
Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means grate and this verb means to rub or to scrub. It will help to think back to 擦れる which means "to chafe" or "to rub," which is more similar to this verb than the kanji meaning is.
する
こする
This kanji shares the reading from 擦れる but it also has another reading, こする. Both are considered "common." Most likely, you'll use する's reading the most because it is the same as すれる's reading, but for now try to keep the other one in your mind as well.
花粉症で目を擦ってたら、片方のコンタクトレンズが破けました。
I was rubbing my eyes because of my allergies and one of my contact lenses was torn.