at one time
at one's disposal
at one's door
at one's ease
at one's own risk
at parting
at peace
at peace with
at present
at random
at rest
at retail
at school
at sea
at short notice
at stake
at that
at that time
at the beginning
at the cost of
at the crack of dawn
at the crossroads
at the discretion of
at the drop of a hat
at the eleventh hour