watch one's step
1.be careful not to make an error 小心;谨慎行事;留意不犯错
Watch your step,young man!If you're late for work again you will lose your job.当心,年轻人!如果你上班再迟到,你就会丢了工作。
2.be careful not to fall or stumble 小心走路;留意不要跌倒或摔跤
Watch your step;the roads are icy.当心不要摔跤,路很滑。