Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Language: French
Origin: 'quality of being perpendicular', from Old French a plomb 'according to the plumb line'

aplomb

 noun
     
a‧plomb [uncountable] formal

with aplomb

in a confident and skilful way, especially when you have to deal with difficult problems or a difficult situation:
Ms Sharpe handled their questions with great aplomb.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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