The idiom "mean business" means to be serious, intentional, or earnest in one's actions or intentions. It implies a level of urgency or importance that requires immediate attention.

The idiom "sponger, sponging, sponge off" refers to someone who is taking advantage of others by using them for personal gain without contributing anything in return. It can also mean someone who is inactive or lazy and relies on others to do everything for them.

The idiom "upside down" means something that is reversed or turned over completely, often in a figurative sense to describe a situation where everything seems wrong or upside-down. It can also refer to someone who is behaving foolishly or out of character.

The idiom "every nook and cranny" means every possible corner, crevice, or space. It is used to describe someone who pays great attention to detail and leaves no stone unturned when looking for something or solving a problem.

The idiom "fool's paradise" is used to describe a place or situation that seems perfect on the surface but is actually full of hidden dangers or problems. It is often used to caution someone about something that may seem too good to be true at first glance.