Japanese: 緊縛

Baku (縛​) , as a noun, means something along the lines of “tying up; restraint; restriction; arrest​”.

Kinbaku means “tight binding” and usually translated as “the beauty of traditional shibari art”.
That is, shibari done in the traditional manner for an aesthetic / erotic effect.

Kinbaku is closely related to semenawa (“torture rope”), one hardly exists without the other.

See also: Semenawa.