~ B ~

Back to square one
Meaning: If you are back to square one, you have to start working on something from the beginning again because the way you worked on it previously failed.
Example: The new manager has left and the team is back to square one.

Bad blood
Meaning: People dislike each other because of arguments in the past
Example: Cheri criticized Bonnie in front of the CEO because there was bad blood between them.

Big fish
Meaning: An important or powerful person in an organization
Example: Mr Anderson is a big fish in this company. He is the president.

Big hitter
Meaning: A powerful and important person in their field.
Example: The chairman of our company is able to invite big hitters in the industry to attend our PR event.

Burn the midnight oil
Meaning: To stay up late in order to finish some work
Example: Gilbert has to submit the report to his manager tomorrow so he will be burning the midnight oil tonight.