Meanings
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1
adv
archaic or literary: formerly; in the past
The sawyer, erst a road mender, watched from the doorway.
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2
adv
First of all, before (some other specified thing).
Consider what I erst have been and what thou seest me now:
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3
adv
Sooner (than); before.
Thenne he sente the varlet ageyne and bad hym telle Kyng Mark that I wille come as soone as I am hole / for erste I maye doo hym noo good "Then he sent the varlet again, and bade him: Tell King Mark that I will come as soon as I am whole, for erst I may do him no good. "
Thesaurus
Etymology
From Middle English erste, from Old English ǣresta (“first”), from Proto-West Germanic *airist (“earliest, first”), equivalent to ere + -est. Cognate with North Frisian iarst, iáárs, jarst, jest (“first”), West Frisian earst (“first”), Dutch eerste (“first”), German erste (“first”).