The document defines common English idioms and their meanings, including: - "Think on your feet" which means making fast decisions. - "A hot potato" refers to a controversial issue. - "An arm and a leg" means something is very expensive. - "The ball is in your court" means it's up to you to make the next move. - "Piece of cake" refers to an easy task. - "Good wine needs no bush" means high quality needs no promotion.