idioms

bear market (a time when the share prices are falling, and a lot of people are selling them) In a bear market, we do not have the sales volume. If the prices fall by more than 20%, then we are in a bear market.   – English Vocabulary

use your brains (think, use your intelligence) It’s very easy; just use your brains. He never uses his brains to deal with problems.      – English Vocabulary

rack your brains (think very hard) It’s not so easy. You have to rack your brains once you start on it. He racked his brains, trying to remember the way out of the building.      – English Vocabulary

  pick someone’s brain (ask for helpful information or advice from someone) I have no idea how to fix this device; let me pick your brain. I want to buy a new English dictionary. Can I pick your brains?      – English Vocabulary

have shit for brains  impolite (to be very stupid) Your new assistant has shit for brains. You have shit for brains if you think you can do it all by yourself.     – English Vocabulary