to fasten together two ends of a piece of string or other long, thin material, or to (cause to) hold together with a long, thin piece of string, material, etc.
Could you tie this piece of string for me?
This skirt ties at the waist.
She tied the ribbon tightly in a bow/knot.
She taught him how to tie a knot in the fishing line.
It's essential to tie the shoelaces securely to avoid tripping.
Sailors are skilled at tying various knots for different purposes.
Use a ribbon to tie the gift box for a decorative touch.