The word "践行" is formed by combining the character "践", meaning to tread or step, which incorporates the radical "足" (foot) to denote physical action, with the character "行", meaning to walk or conduct, which signifies movement or execution. Together, they create a compound where "践" implies engaging in or stepping into an activity, and "行" emphasizes carrying it out, resulting in the meaning of putting something into practice or action.