If I were you, I wouldn't tangle with them.是什么意思？

If I were you, I wouldn't tangle with them.

我要是你, 我就不跟他们争吵.

if

conj. 如果，倘若，即使，〈口〉是否，假设；n. 条件，设想；

例句
She was old enough to absent herself from the lunch table if she chose...
她长大了，可以自己做主不来吃午餐了。

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

you

pron. 你，你们，您们，各位，大家；

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

tangle

n. 纠缠，纠纷，混乱，慌乱，昏乱的状态，争论；vt.& vi. （使）缠结，（使）乱作一团，使陷入，捕获，使纠纷，参加辩论、争执或冲突；

例句
...a diplomatic tangle of great complexity.
非常复杂的外事纠纷

with

prep. 和，跟，随着，关于，和…一致；

例句
A waiter entered with a tray...
侍者端着托盘进来了。

them

pron. 他们，她们，它们；

例句
I take care of them to the best of my abilities...
我尽我所能地照顾他们。