flatten

/ˈflæt̬.ən/

动词

（使）变平，把…弄平
Several trees were flattened (= knocked down) by the storm.
暴风雨把几棵大树刮倒了。
（使）变平坦；（使）变薄
The biscuits will flatten out as they cook.
烘烤时饼干会变得扁平。