to fight against the usual way of doing something.

Tom spent much of his working life bucking the system, which explains why he didn't get many promotions.

• be like watching paint dry
• be like water off a duck's back
• be living on another planet
• bells and whistles
• belly laugh
• be long for this world
• be long in the tooth
• be lost for words
• below the belt
• belt out
• belt out something
• be made for
• be made for someone
• be made for something
• be main squeeze
• be make or break for
• be make or break for someone
• be make or break for something
• be man enough
• be man enough to do something
• be meat and drink to
• be meat and drink to someone
• be miles away
• be minting it
• be money for old rope