Definition of "at a loss" in English

Prepositional phrase

1. Below the cost or price of purchase.

   • We sold those old computers at a loss.

2. Not sure; uncertain; lacking further ideas, direction, or ability.

   • I have fixed the parts I understand, and the rest leaves me at a loss.
   • His policies may be ineffective, but he is never at a loss for words.
   • I'm at a loss how to proceed.