the.com/handshake

means A gesture of greeting, agreement, or farewell in which two people clasp right hands and briefly grip or shake them.

from A plain English compound of "hand" and "shake," both ancient Germanic words. The gesture itself is old — clasping right hands appears in Greek and Roman art as a sign of trust and pledged faith — but the word "handshake" as a single noun is a relatively recent English assembly, with the verb phrase "shake hands" coming first. The folk story that it began as a way to show your weapon hand was empty is widely told and plausible-sounding, but not actually documented; treat it as charming legend rather than proven history.