On thin ice
Definition: doing something risky which may have serious or unpleasant consequences.
Be all ears
Definition: to be waiting eagerly to hear about something.
Come in Handy
Definition: to be useful for a particular purpose.
Off the charts
Definition: it could mean at a very high level or extremely popular or successful.
Go downhill
Definition: to gradually become worse.
Cut to the chase
Definition: to talk about or deal with the important parts of a subject and not waste time with things that are not important.
Fair and square
Definition: in an honest way and without any doubt.
Be on board
Definition: in agreement with a particular course of action, especially so that you get involved with it.
Not know [somebody] from Adam
Definition: to have never met someone and not know anything about them.
Open a can of worms
Definition: to create a situation that causes a lot of problems when it starts to be dealt with.
Come clean [with somebody]
Definition: to tell the truth about something that you have been keeping secret.
Kook/kooky
Definition: strange in his or her appearance or behaviour, especially in a way that is interesting.
Give [someone] ammunition
Definition: to provide them with information, facts, or arguments that they can use against you in a discussion or argument.
Be hung up on [something/someone]
Definition: to be extremely interested in or worried by a particular subject and spend an unreasonably large amount of time thinking about it.
Shoot/aim for the stars
Definition: to set your goals/ambitions very high; to try to achieve something very difficult; to aim high, to aim big, be ambitious, follow your dreams.
Know [someoneβs] way around
Definition: to be familiar with a place or organization and able to act effectively within it.
Get [something] straight
Definition: make sure that you understand it properly or that someone else does.
Step on [oneβs] point
Definition: you made a certain point, and the next person made their point while at the same time saying something that negated your point in some way.
Something is not rocket science
Definition: something is not difficult to understand or figure out.
Steer clear off somebody or something
Definition: to avoid someone or something that seems unpleasant, dangerous, or likely to cause problems.