I know that Miss Stoner has been here. I traced her! I am a dangerous man to fall foul of! See here.

我知道斯托纳小姐来过这里，我跟踪了她。我可是一个不好惹的危险人物！你瞧这个。

" Eh? " said Trumpkin. " What's that? What have you been doing, Human, to fall foul of Miraz at your age? "

“嗯？”杜鲁普金问：“什么意思？人类，你做了什么事，在你这个年纪就得罪了弥若兹？”

And finally there was to fall foul of something or someone, which is 'to make a mistake and get into trouble with someone'.

最后是得罪某物或某人，意思是“犯错然后跟某人陷入纠纷”。