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at a loss
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Quick answer
As an adjective, at a loss means filled with bewilderment. As an adverb, it means below cost.
Meanings of at a loss
2 meaningsadjective
Filled with bewilderment
“at a loss to understand those remarks”
“puzzled that she left without saying goodbye”
Similar: nonplused, nonplussed, puzzled
adverb
Below cost
“sold the car at a loss”
Meanings from Wiktionary (CC BY-SA 4.0) and Open English WordNet (CC BY 4.0).
Synonyms by meaning
adjective: filled with bewilderment