at a white heat—in a state of intense or extreme emotion:
Arrhythmic vs Eurhythmic
Arrhythmic refers to lacking rhythm or the regularity of rhythm.
Aware vs Cognizant vs Conscious vs Sensible vs Alive vs Awake
Aware, cognizant, conscious, sensible, alive, awake mean having knowledge of something, especially of something that for some reason is not obvious or apparent to all.
At a walk vs In a walk
at a walk—at the ordinary gait:
Arrant vs Errant
Arrant means confirmed, downright, or extreme.
Average vs Mean vs Median vs Norm vs Par
Average, mean, median, norm, par denote something and usually a number, a quantity, or a condition that represents a middle point between extremes.
At a time vs At one time
Note: The expression does not correlate in meaning with the phrase at times—now and then:
Avenge vs Revenge
Avenge, revenge mean to inflict punishment on a person who has wronged oneself or another.
Arraignment vs Indictment
Arraignment is formally calling a defendant to answer a charge.
At a stroke vs At the stroke
at a stroke—suddenly and with a single action or effort:
Auxiliary vs Subsidiary vs Accessory vs Contributory vs Subservient vs Ancillary vs Adjuvant
Auxiliary, subsidiary, accessory, contributory, subservient, ancillary, adjuvant mean supplying aid or support.
At a stretch vs On the stretch
at a stretch—1. continuously; without interruption: