1. To remain physically out of the way (of someone or something). We're going to be loading equipment through these doors all morning, so please stay clear until we're done. You've got to stay clear of the workers while they're laying the cement.

2. To keep away from or avoid interacting or dealing with (someone or something). Stay clear of the boss today—he's yelling at everyone he sees. The subway is running really late due to the strike, so I suggest you stay clear if you want to get to work on time.