have been doing; continue doing up to the presentAttached to a verb, this construction describes an action or process that began in the past and has continued up to the present.
KO: ‘먹어 오다’라는 표현은 과거부터 지금까지 계속 먹었다는 뜻이에요.
EN: The expression “먹어 오다” means that someone has continued eating from the past up to the present.