Is looking down a sign of submission?
Just so, what does it mean if someone looks you up and down?
It will often mean that he is checking you out especially if he only does it to you and he shows other signs of attraction when around you. It can also be that he is initially observing to see if you're a threat or that he is observing your outfit.
Also know, when someone puts their head down when they see you?
If their head is pointing down, this could be a sign of submission. Or it could be an unconscious attempt to cover up their throat and protect it. Sometimes this could be because they don't want to appear threatening, or because they feel intimidated or shy.
If someone looks you up and down, they direct their eyes from your head to your feet, in a rude and superior way and often as though they disapprove of you. The students looked me up and down as though I were a Martian.