Final answer:
In this sentence, the word 'foot' refers to the anatomical structure we use for standing, walking, and running.
Step-by-step explanation:
In the sentence, 'My right foot is bigger than my left foot,' the word 'foot' refers to the anatomical structure that we use for standing, walking, and running. It is the end part of our leg that we use to support our body weight.
For example: When we walk, we take steps by lifting one foot off the ground and moving it forward, and then repeating the process with the other foot.