어 달다

Ask someone to do it for you

달다 is the version of 주다 'do for someone' that points at the speaker: it means do it for ME. In practice it appears almost only inside a request being reported — 다시 말해 달라고 할 때 써요 'you use it when asking someone to say it again', 다들 나한테 팬 빌려 달라고 해 'everyone keeps asking to borrow my pens.' If the favour is for someone else, you use 주다 instead.