veiller au grain

1. 1

   to be on guard for a sudden, violent gust of wind

2. 2

   to keep an eye on things, to look out for squalls, to keep a weather eye open

   Déjà les biographes veillaient au grain.

真题出处来自 FreeTCF 题库，做题要在 FreeTCF 登录；这里只列出这个词出现的句子。