a male deer, hare or rabbit (also called a buck rabbit) 雄鹿；公兔
[C] (informal) a US, an Australian or a New Zealand dollar; a South African rand; an Indian rupee （一）美元；（一）澳元；（一）新西兰元；（一）南非兰特；（一）印度卢比
They cost ten bucks.
这些值十元钱。
We’re talking big bucks (= a lot of money) here.
我们这当儿谈的可是大买卖。