Its body plumage suddenly began to ruffle and swell.是什么意思？

Its body plumage suddenly began to ruffle and swell.

它全身的羽毛突然竖了起来，胀得鼓鼓的。

its

pron. (it的所有格形式)它的，厥；

例句
The government is to accelerate its privatisation programme.
政府将加快其私有化计划的进程。

body

n. 身体，尸体，团体，物体；vt. 赋予形体；

例句
...drugs which will fool the body into accepting transplants.
能使身体顺利接受移植器官的药物

plumage

n. 鸟类羽毛，漂亮衣服，羽衣；

例句
The bright plumage of many male birds has evolved to attract females...
很多雄鸟进化出鲜艳的羽毛是为了吸引雌鸟。

suddenly

adv. 意外地，忽然地，奄，勃，霍然；

例句
'It was incredible,' Kurt says, suddenly aglow.
“简直难以置信，”库尔特突然满面红光地说。

began

v. 开始( begin的过去式 )，着手，创始，创办；

例句
He began comically ad-libbing a script...
他即兴调侃起了一段剧本。

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。

ruffle

n. 褶裥，混乱，（鼓的）轻擂声，急躁，生气；vt.& vi. 弄皱，激怒，连续地轻敲，扰乱；

例句
I could tell that my refusal to allow him to ruffle me infuriated him.
我能看出，我不吃他那一套让他很恼火。

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

swell

vt.& vi. 增强，肿胀，膨胀，充满（激情）；n. 汹涌，重要人士，（尤指身体部位）凸起的形状，声音渐强；adj. 极好的，了不起的，非常棒的；

例句
The industry reckons it will see orders swell by 10% this financial year. Some hope.
业界估计本财年订单会增加10%。这绝对不可能。