Longman Dictionary of Contemporary English homepage

buck

2 verb
     
buck2
1

horse

[intransitive] if a horse bucks, it kicks its back feet into the air, or jumps with all four feet off the ground
2

move suddenly

[intransitive] to suddenly move up and down or backwards and forwards in an uncontrolled way:
The plane bucked sharply.
3

oppose

[transitive] to oppose something in a direct way:
He was a rebel who bucked the system (=opposed rules or authority).
Unemployment in the area has bucked the trend by falling over the last month.
buck against
Initially he had bucked against her restraints.
4

make somebody happier

[transitive] to make someone feel more happy, confident, or healthy:
He was bucked by the success he'd had.
She gave me a tonic which bucked me a little.

buck for something

phrasal verb
to try very hard to get something, especially a good position at work:
He's bucking for promotion.

buck up

phrasal verb
1 to become happier or to make someone happier:
Come on, buck up, things aren't that bad!
buck somebody ↔ up
You need something to buck you up.
2

buck up!

British English old-fashioned used to tell someone to hurry up:
Buck up, John! We'll be late.
3 informal to improve, or to make something improve:
It'll be a long time before the situation starts to buck up.
buck something ↔ up
a company that is looking to buck up its networking capabilities
4

buck your ideas up

British English informal used to tell someone to improve their behaviour or attitude
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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