A/B verb 1adjective 1forms 3 verb1 •To compare two pairs of headphones or earphones by switching between one and the other.Any queries about how it compares to LCD-4, Utopia, 1266/Diana, Susvara et cetera would have to be answered by someone with more experience A-Bing those headphones. — 2019 adjective1 •Initialism of acid-base. formsA/Bed · A/Bing · A/Bs