knot

A compact intersection of interlaced material, such as cord, ribbon, or rope.

A fastening made by tying together lengths of material, such as rope, in a prescribed way.

A decorative bow of ribbon, fabric, or braid.

A unifying bond, especially a marriage bond.

A tight cluster of persons or things.

A feeling of tightness.

A complex problem.

A hard place or lump, especially on a tree, at a point from which a stem or branch grows.