know what you are about be aware of the implications of your actions or of a situation, and of how best to deal with them. informal
1993Ski Survey He ran a 3-star guest house before this, so knows what he is about.
英语词组固定搭配大全包含15956条英汉双解词组，基本涵盖了全部常用英文词组、短语的翻译及用法，是英语学习的有利工具。