noun / verb
pin
PIN/pɪn/
A small pointed fastener used to hold things in place.
A straight pin holds the folded fabric in place.

Etymology
Latin pinna meant “feather” but also named projecting features such as pinnacles and headlands. Its extended use for points led to the peg or fastener meaning.
In context
side of the garment, and it's too small. So, I've marked a pin here where we need to let it out some here.
More examples
- She pins a note to the bulletin board.
- He pinned the blanket down with a heavy book.
- Keep loose pins in a small box.
Forms
pin · pins · pinned · pinning
unpin verb — To remove pins or release something pinned.