挂钩

guà gōuguagou

1. to couple; to link; to hook together
2. (fig.) (preceded by 與|与[yu3] + {entity}) to establish contact (with {entity}); (Tw) to collude (with {entity})
3. (fig.) to link (marketing efforts with production etc); to peg (welfare payments to inflation etc); to tie (remuneration to performance etc)
4. hook (on which to hang sth); latch hook; coupling

Study it in Yanamino