english
                    
                    
                    
                        1
                           general:: 
                            buck (sb/sth) up 
 UK informal 
 to become happier or more positive or to make someone happier or more positive 
• Oh, buck up for heaven's sake, Anthony! I'm sick of looking at your miserable face.
• She was told that if she didn't buck her ideas up (= start working in a more positive way) , she'd be out of a job.
• A holiday will buck her up.
                        
                        
 
                        
                            Cambridge-Phrasal Verbs
                        
                        
                    
                    
                        2
                           general:: 
                            noun
male deer:  
He shot a buck in last year's deer season.
verb
oppose. challenge:  
Do not try to buck the system.
adj.
lowest rank:  
He started his career as a buck private,
                        
                        
 
                        
                            Simple Definitions
                        
                        
                    
                    
                        3
                           general:: 
                            In addition to the idioms beginning with BUCK,  Also see  BIG BUCKS; FAST BUCK; MORE BANG FOR THE BUCK; PASS THE BUCK.
                        
                        
 
                        
                            American Heritage Idioms