A Section
-Ace up your sleeve: It means you have something that will give you an advantage that other people don't know.
-Achilles’ heel: a big weakness which might hurt you even though you have good skill

-Add fuel to the fire: to make a bad situation worse
-Afraid of your own shadow: very nervous

-Air your dirty laundry in public: If you air your dirty laundry in public, you reveal aspects of your private life that should really remain private, by telling a secret, arguing in public, etc.
-Albatross around your neck: An albatross around, or round, your neck is a problem resulting from something you did that stops you from being successful.

-All ears: If someone says they're all ears, they are very interested in hearing about something.
-All that glitters is not gold: This means that appearances can be deceptive and things that look or sound valuable can be worthless.

-All thumbs: too excited or clumsy to do something.
-Ants in your pants: agitated or excited about something and can't keep still.

Asleep at the switch: It means not taking his or her job very seriously.
At the drop of a hat: doing something quickly without any pauses or hesitation to think

B Section
-Babe in the woods: It means inexperienced person
-Back to square one: It means back to the beginning
-Back to join board: To be prepared
-Backseat driver: A passenger that gives unwanted advice to the driver
-Baker’s dozen: It is being given or received as dozen while it contains 13 which contains extra.
-Ballpark figure: an approximate or an estimate of something.
-Bark is worse than your bite-
Bark up the wrong tree-