be at a loss

be at a loss

To be uncertain of how to proceed or what to do or think. Your behavior is absolutely unacceptable. I'm at a loss as to what to do with you. Now that the whole schedule has been rearranged, I'm at a loss.
See also: loss
References in classic literature ?
There is no doubt about that," replied the major; "and as we shall have to employ an immense quantity of metal, we shall not be at a loss for choice.