We had to bushwhack through undergrowth.是什么意思？

We had to bushwhack through undergrowth.

我们只好在灌木丛中劈开一条路。

we

pron. 我们，咱们，笔者，本人，朕，人们；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

had

v. 有（ have的过去式和过去分词 ），（亲属关系中）接受，拿，买到；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

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。

bushwhack

v. <美>在丛林中开路，在丛林中伏击；

例句
We had to bushwhack through undergrowth.
我们只好在灌木丛中劈开一条路。

through

prep. 通过，穿过，经由，透过，凭借；adv. 从头到尾，彻底，自始至终；adj. （电话）接通，通话完毕，有洞的，直达的；

例句
The proposal was instantly voted through with two to one in favour, accompanied by enthusiastic applause...
在热烈的掌声中，提案以2比1的优势很快通过了表决。

undergrowth

n. 矮树丛，灌木丛，（动物）浓密绒毛，发育不全；

例句
Trees, undergrowth and creepers intertwined, blocking our way...
树木、灌木丛与藤蔓植物盘根错节,挡住了我们的去路。