If you catch someone on the hop, you do something when they are not expecting it and are not ready.

If something is the height of folly, it is completely ridiculous and will end up badly.

If you are in the grip of something, you are beingcontrolled by something unpleasant or that you don't want to be controlled by.

If you are in the grip of something, you are beingcontrolled by something unpleasant or that you don't want to be controlled by.

If you get a grip on yourself, you control your emotions and feelings under difficult circumstances.

If you loosen your grip on something, you hold it or control it less tightly.

If someone joins a company or organisation and immediately makes many changes, we say that a new broom sweeps clean.

If you flip someone the bird, you put your middle finger up to show that you are angry or annoyed.

If someone is on the rack, they are suffering greatly.

If something is a wrap, it is completed, especially a scene being filmed.