B1 the most excellent in a group of things or people: My tastes are simple - I only like the best. He wanted the best for his children - good schools, a nice house, and trips abroad. I like all of Hitchcock's films, but I think "Notorious" is the best. Chris and I are the best of friends (= we are very close friends).all the best A2 informal › used to say goodbye, or to end a letter to someone you know well, or to send good wishes to someone: All the best to your parents!at best C2 even when considered in the most positive way: The food was bland at best, and at worst completely inedible.at its best B1 at the highest standard that can be achieved: The documentary was an example of investigative journalism at its best.be at your best › to be as active or intelligent as you can be: I'm not at my best in the morning.best of all B2 this is the most pleasing thing: There was wonderful food, good company, and, best of all, a jazz band.best of luck › used to wish someone success before a test, etc. or a difficult activity: US Best of luck on your finals!UK Best of luck with your finals! We would like to wish you the (very) best of luck on/with your move to France.the best of › In a sport such as tennis, if you play the best of a particular number of games, you play that number of games and the winner is the player who wins the greatest number of those games: Shall we play the best of five?do/try your (very) best B1 to make the greatest effort possible: It doesn't matter if you fail, just do your best.have had the best of › If you have had the best of something, you have enjoyed the most pleasant part of it, and everything that is left is worse: I think we've already had the best of the hot weather this summer.to the best of your ability › as well as you can: Just do the job to the best of your ability.to the best of my knowledge/belief B2 from what I know and understand from the information that I have: To the best of my knowledge, the chemicals which were found are not dangerous.for the best C2 If an action is for the best, it is done to improve a situation or produce a good result, although it might seem unpleasant at the time: Ending a relationship is always hard but in this case it's for the best.make the best of B2 to make an unsatisfactory situation as pleasant as possible: We'll have to spend the night here, so we might as well make the best of it.