This is a very basic form of couching. It, essentially, teaches you the technique of couching. This method can be used to make outlines, or layers of this stitch can be made to fill in patterns. Using contrasting colors can create nice and interesting variations. Do not feel afraid to experiment a bit with colors and kinds of threads.

I will work this stitch over a curved line to show how easily this stitch can take meander.

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Fig 1: Start by bringing out a thread (brown in the illustration) for laying from one end of the stitch line. Keep it open.
Now, bring another thread (red in the illustration) out, a little outside the stitch line, and away from the other thread, as shown. 
Fig 2: Now, keep the laid thread over the stitch line. Use the other thread to fasten the laid thread down using a small stitch, as shown. 
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Fig 3: After fastening, the stitch will look like this.  Fig 4: Now, bring the fastening thread out as a short distance from the earlier stitch as shown. Lay the open thread over the stitch line, and again fasten it down with a small stitch. 
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Fig 5: Continue with this method for the entire stitch line. To finish up, pass the laid thread through the fabric and knot it.Make sure the fastening thread is brought out at regular intervals to make it look elegant.  Fig 6: A finished couched line will look like this. 
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