The act of greeting someone by locking thumbs is known as the “thumb lock” or “thumb grip.” It is a friendly gesture that is common in several countries around the world, including China, Japan, Korea, and Vietnam. To perform the thumb lock, two people clasp their hands together, interlocking their thumbs.
The thumb lock is often used as a greeting among friends and family members. It can also be used to show respect or gratitude. In some cultures, the thumb lock is also used as a way to seal a deal or agreement.
