to attach a boat to a fixed object with a rope; to tie sb's arms and legs tightly so that they cannot move or escape
to attach a boat to a fixed object with a rope
We tied up alongside the quay.
to close sth with a knot; to be closed or fastened with a knot
to tie up a garbage bag
tie sb up
to tie sb's arms and legs tightly so that they cannot move or escape
The gang tied up a security guard.
tie sb up
to keep sb busy so that they have no time for other things
I'm tied up in a meeting until 3.
Definiciones del Oxford Advanced Learner's Dictionary, 9.ª edición