How do you say this another way?
The coast's clear.
Does it mean,
It seems no problem.

Question

How do you say this another way?
The coast's clear.
Does it mean, 
It seems no problem.

Answer

It means that the area is free of the people that might catch you. Other ways of saying it could be “The are is safe “ or “green light “ .

Answer

The coast IS clear. It means no one is around to catch you doing something that you probably shouldn't be doing. Another way to say it. Hmmmmm.... maybe you're safe for now