All Bark And No Bite:
When someone is threatening and/or aggressive but not willing to engage in a fight.
All Greek to me:
Meaningless and incomprehensible like someone who cannot read, speak, or understand any of the Greek language would be.
All In The Same Boat:
When everyone is facing the same challenges.
An Arm And A Leg:
Very expensive. A large amount of money.
An Axe To Grind:
To have a dispute with someone.
Apple of My Eye:
Someone who is cherished above all others.
As High As A Kite:
Anything that is high up in the sky.
At The Drop Of A Hat:
Willing to do something immediately.