I just managed to smother a yawn.是什么意思？

I just managed to smother a yawn.

我刚设法忍住了一个呵欠。

just

adv. 刚才，仅仅，只是，正好，刚要；adj. 公正的，合理的，恰当的，合法的，正确的；

例句
It became very clear that the incident was not just an aberration, it was not just a single incident.
事实已经很清楚，这件事不是偶发的，它并不是一起孤立的事件。

managed

v. 使用( manage的过去式和过去分词 )，完成（困难的事），经营，明智地使用（金钱、时间、信息等）；

例句
Greenpeace managed to assemble enough boats to waylay the ship at sea...
绿色和平组织设法聚集起足够数量的小船在海上拦截该船。

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

例句
I suggest you leave it to an expert...
我建议你把它留给专家来解决。

smother

v. （使）窒息，（使）透不过气，遮掩，抑制；n. 窒息物，浓烟，浓雾；

例句
The girl's parents were also burned as they tried to smother the flames.
女孩的父母试图扑灭大火的时候也被烧伤了。

yawn

vi. 打呵欠，张开，裂开，<文学>张开大口；n. 呵欠，无聊的人或事，裂口；

例句
Her yawn suggests that she is sleepy.
她打哈欠表示她很困了。