ଅର୍ଥ : At a previous time.
ଉଦାହରଣ :
At one time he loved her.
Her erstwhile writing.
She was a dancer once.
ସମକକ୍ଷ : at one time, erstwhile, formerly, once
Erst ka meaning, vilom shabd, paryayvachi aur samanarthi shabd in Hindi. Erst ka matlab kya hota hai?