v make flat or flatter
v become flat or flatter
v lower the pitch of (musical notes)
s having been flattened
a. [医]（水）平扁的, 弄平的
v. 变平, 使（某物）变平( flatten的过去式和过去分词 ); 彻底打败某人, 使丢脸; 停止增长（或上升）; （把身体或身体部位）紧贴…
1. The box was flattened for easy storage.
这个盒子被压平以便于存放。
2. She flattened the dough before rolling it out.
她在擀面之前把面团压平了。
3. The tire was flattened after hitting a sharp object.
轮胎在撞到尖锐物体后被刺破了。