IPA: /aʊtˈsɛl/
KK: /aʊtˈsɛl/
To sell more of something than someone else or to sell more than a certain amount.
The new smartphone model is expected to outsell its predecessor by a large margin.
Past: outsold
Past Participle: outsold
Outsell → It is formed from "out-" (meaning beyond or surpassing) and "sell" (from Old English "sellan", meaning to give or deliver). The word "outsell" means to sell more than someone else or to surpass in sales.
Think of going 'beyond' ('out-') in 'selling' — that's why outsell means to sell more than others.