A

Add fuel to the fire

- When you do something that makes a bad situation worse

Afraid of your own shadow

- To be extremely nervous and easily frightened

Ace up your sleeve

-Have something that will give you an advantage that other people don't know about

Achilles hill

- Showing weakness

Air your dirty laundry in public

-To discuss private personal information in public

Albatross around your neck
-A problem resulting from something you did that stops you from being successful

All ears

-to be waiting with interest to hear what somebody has to say

All that glitters is not gold
-appearance can be deceptive and things that look or sound valuable can be worthless

All thumbs
-
 having difficulty, clumsy
Ants in your pants

- excited about something so can not wait
Apple of your eye
- that person (or thing) that you care for the most
As the crow flies
-the shortest route between two points (measure in straight line)
Asleep at the switch
- not doing their job or taking their responsibilities very carefully
At the drop of a hat
-do it immediately
At the end of the rope
- at the limit of your patience or endurance
Ax to grind
-to have a selfish reason for saying or doing something