Where does “unlagging” come from?

unlagging (English) comes from English lagging, from English LAG — Loose and aggressive.

unlagging (English): Not lagging; untiring

Definitions

  1. Not lagging; untiring

Ancestry of “unlagging”, step by step

unlagging traces back through two separate lines of ancestry.

via English lagging

StepLanguageWordMeaning
1Englishlaggingfalling behind, not keeping up the pace;...
2EnglishLAGLoose and aggressive

via English un

StepLanguageWordMeaning
1EnglishunOne
Every word from English LAG
unlagging — Etymology, Origin & Word History | Etymology Explorer