|at sixes and sevens
||not in agreement, confused, in a state of confusion, arguing, at loggerheads
||Parents and teachers are at sixes and sevens over sex education.
||what you could lose or gain
||If you're involved in a crime, your career may be at stake.
|at the crack of dawn
||at the first sign of light, at first light
||At the crack of dawn he would rise, wash and go for a walk.
|at the drop of a hat
||without hesitation, quickly
||He'll argue at the drop of a hat. He likes to argue.
|at the end of my rope/ at the end of my tether
||losing control of myself, losing patience (see lose patience)
||Babysitting five kids, I was at the end of my rope.
|at the hands of
||while competing against, when fighting
||It was at the hands of his former student that he was defeated.
|at the ripe old age
||at a very old age; being unusually old
||He could still play checkers at the ripe old age of ninety-eight.
|at the top of her game
||at her best, playing as well as she can
||If Val's at the top of her game she can defeat Olga.
|at the top of his voice
||as loud as he can, shouting loudly
||Ben called for help at the top of his voice. "Help!" he shouted.
|at the wheel
||driving a car, steering a car or truck
||Who was at the wheel when the car went off the road?