Thumbing is pressing with the thumbs point by point along a sen line.
In 📝Thai Bodywork it usually follows palming, not as a first stroke. The contact is specific and rhythmic; speed and digging are how it bruises. It is a method, not a diagnosis, not needling, and not a claim to treat a point as a medical event. Pressure stays breathable. Bony edges and the front of the neck are skipped or barely touched.
Clients feel a precise path. Sharp, numb, or panicky sensation is a stop.