出典:Wiktionary
From Middle English smertyng, smertinge, from 古期英語 smeortung, smertung (“smarting, itching”), equivalent to smart + -ing.
smarting (comparative more smarting, superlative most smarting)
smarting (countable かつ uncountable, 複数形 smartings)
「smarting」は動詞「smart」の現在分詞です