IPA: /ˈduːər/
KK: /ˈduːər/
A person who takes action or gets things done, often in a proactive or energetic way.
She is a doer who always finds a way to complete her projects on time.
Doer → It is formed from "do" (from Old English "don", meaning to perform or act) and "-er" (meaning a person who). A doer is a person who performs or acts.
Think of someone who 'acts' ('do') — the '-er' just means a person. A doer is someone who takes action.