Longman Dictionary of Contemporary English - buck

~1 n 1 »MONEY« AmE, AustrE informal a dollar  (He owes me ten bucks. | big bucks (=a lot of money) | make a fast buck (=make some money quickly, often dishonestly)) 2 pass the buck to try to blame someone else or make them responsible for something that you should deal with  (You were the one who took on this job. Don't try to pass the buck.) 3 the buck stops here used to say that you are the person who is responsible when no-one else will accept the responsibility 4 »MALE ANIMAL« plural buck or bucks a male deer, rabbit etc  (- compare doe) 5 feel/look like a million bucks AmE informal to feel or look very healthy, happy, and beautiful 6 buck naked AmE informal wearing no clothes at all 7 »WELL-DRESSED MAN« a well-dressed young man in early 19th-century England  (a Regency buck) ~2 v 1 »HORSE« if a horse bucks, it kicks its back feet into the air, or jumps with all four feet off the ground 2 »THROW SB« to throw a rider off by jumping in this way 3 »CAR« AmE if a car bucks, it moves forward in a way which is not smooth, but stops and starts suddenly 4 »OPPOSE« informal to oppose something in a direct way; resist + against/a  (Initially he bucked against her restraints, but later came to accept them. | buck the system (=avoid the usual rules))  (natural rebls, with the guts it takes to buckt he system | buck atrend)  (The growth of the company has bucked the current recessionary trend in the industry.) buck for sth phr v to try very hard to get something, especially a good position at work  (He's bucking for promotion.) buck up phr v 1 T buck someone up) to become more cheerful or make someone more cheerful  (Come on, buck up, things aren't that bad!) 2 buck up! BrE spoken used to tell someone to hurry up  (Buck up, John! We'll be late.) 3 buck your ideas up BrE informal used to tell someone to try harder to improve their behaviour or attitude