Sentence:  The Arabs hate the French more than they hate us. Having more reason to do so, they are more polite; in other words, they have learnt not to <WSD>try it on</WSD>, when they meet a European. 
Meaning of the word marked with <WSD> tags:  To test someone to see how much bad behaviour they will tolerate; to try to deceive someone to see how gullible they are.