" To spot (someone)" is another informal expression meaning to make a loan to someone, to give money to someone expecting that person will pay you back – will give you the money back eventually.

“发现（某人）” 是另一种非正式表达方式， 意思是向某人借钱，给某人钱，希望那个人会偿还你 –最终会把钱还给你。