flatten out
US /ˈflæt.ən aʊt/
UK /ˈflæt.ən aʊt/

短语动词
1.
变平, 弄平
to become flat or level, or to make something flat or level
示例:
•
The road started to flatten out after the steep climb.
陡峭的爬坡后,道路开始变平。
•
You need to flatten out the dough before baking.
烘烤前你需要把面团擀平。
在 Lingoland 学习这个单词