VOCAB, IDIOMS, EXPRESSIONS AND SO ON. UNIT 7

• To be on the right track = to think or do sth. that could benefit you = to be on fire (estar en racha).*
• To be as busy as a bee = to be a busy bee = to be very busy.
• To go under the knife = to have an operation.
• To be two-faced = to say nice things to the face, but bad ones behind the back.
• To be blue = to be sad.
• To be a grey area = to be shades of grey = to be no clear solution because there are no rules and it's hard to decide what is right and wrong.
• To be 'pie in the sky' = to be sth. unlikely to happen.
• To reinvent the wheel = to waste time trying to create sth. that  has already been made.