Answer: FALL (to fall into, to fall flat, to fall for sb)
Answer: whitewash (to make something bad seem acceptable by hiding the truth OR to defeat a player or team completely, especially while preventing them from scoring any points)
When you know that you are good at it and you enjoy it, Answer: A (to be in your element: in a situation you know well and enjoy)
Answer: TO TRUMP STH UP/ TRUMP UP STH (to give or use false information so that someone will be accused of doing something wrong and punished)