Sophisticated

Having refined taste, knowledge, or experience of the world

Cost an Arm and a Leg

Something that is very expensive

Ball Is in Your Court

It is your turn to take action or make a decision

Catch Someone with Their Pants Down

To discover someone in an embarrassing situation

Steal the Show

To attract the most attention and praise at an event

Bite the Hand That Feeds You

To act badly toward someone who has helped you