Bokhara couching is the use of a particular embroidery stitch, in which the same thread is used both for the laid and the tying down stitches. The couching thread is carried across the space from left to right and then fastened down by the needle on its return journey with slanting stitches at regular intervals. These stitches are often used to form a series of pattern lines across the area being decorated.
Bokhara couching is similar in technique to Roumanian couching, but the effect is different. In Bokhara couching the tying down stitch is short on the surface and long underneath, while in Roumanian couching it is a long stitch on the surface and a short one beneath.
See the Creation tapestry
GVE