끼이다

1. be stuck in; be fastened
For something to be put inside a gap and tightened so that it does not fall out.

2. be stuck in; be laced
For something to be threaded or stuck in so that it does not fall out.

3. be caught in; be jammed in
To be embedded or stuck in a chink.

4. be mixed in
To be mixed in many people or things.

5. join; take part in
To be involved in or participate in something.