What does the saying watch your step'' mean?

Answer 1

The phrase "Watch your step" is a warning to walk carefully--as in to watch where you put down your feet.

Generally, it means the ground is uneven or could contain hazards. For example, you don't want to walk blindly onto or off a curb where you could trip or tip over and crash to the ground. Similarly, ground known to contain metal shrapnel or broken glass is best trodden with properly-hardened footwear.