bone up (on something)

Другие идиомы:

• back the wrong horse
• badger (someone)
• bark up the wrong tree
• best-laid plans of mice and men
• bet on the wrong horse
• black sheep of the family
• bright-eyed and bushy-tailed
• bull in a china shop
• buy a pig in a poke
• by shank's mare
• bat out of hell
• bats in the belfry
• bird brain
• bird in the hand is worth two in the bush
• birds and bees