1-idiom:above board
meaning:If something is above board, it's been done in a legal and honest way.
2-idiom:easy money
meaning:You can say "easy money" to describe money that someone gets without having to make much effort.

3-idiom:in the dark
meaning:If you're in the dark about something, you don't know about it.

4-idiom:under you hat
meaning:If someone tells you a secret and you keep it under your hat, you don't tell anyone.meaning:If something is above board, it's been done in a legal and honest way.
2-idiom:easy money
meaning:You can say "easy money" to describe money that someone gets without having to make much effort.

3-idiom:in the dark
meaning:If you're in the dark about something, you don't know about it.

4-idiom:under you hat
5-idiom:a piece of cake
meaning: you say that something is a piece of cake, you mean that it is extremely easy.

