The idiom "vent spleen" means to express anger, frustration, or resentment. It can also mean to complain or criticize openly and vocally.

The idiom "alter ego" refers to someone who is similar to a person but different from them, often in terms of their personality or behavior. It can also refer to an alternate version of oneself that one may present to others.

"Sell like hot cakes" is an idiom that means to sell something quickly and in large quantities, often exceeding expectations or predictions. It implies that the item being sold is highly popular and sought after.

The idiom "hit the books" means to study or prepare for exams or tests intensely, often by reading textbooks or studying materials related to a particular subject. It is commonly used to describe someone who is studying hard and focused on their academic performance.

The idiom "down for the count" means to be completely knocked out or unconscious. It can also mean to be defeated or to fail badly. The phrase originated from boxing, where fighters are counted out by the referee after they have been knocked down multiple times.