presume on/upon somebody's friendship/generosity etcto unfairly ask someone for more than you should, because they are your friend, are generous etc 利用某人的友谊/慷慨等 It would be presuming on his generosity to ask him for money. 向他要钱等于是在利用他的慷慨占他的便宜。
presume on/upon somebody’s friendship/generosity etc• I will not presume upon your friendship any further.
→ presume on/upon somebody’s friendship/generosity etc at presume(1)