The word "保镖" is formed by combining the character "保" (bǎo), which means to protect or guard, with the character "镖" (biāo), which refers to a dart or projectile weapon historically associated with armed escorts. Together, they create a compound where "保" conveys the action of safeguarding, and "镖" specifies the context of weaponry or defense, resulting in the term for a bodyguard or security guard.