Definify.com
Webster 1913 Edition
Erst
1.
First.
Chaucer.
2.
Previously; before; formerly; heretofore.
Chaucer.
Tityrus, with whose style he had
erst
disclaimed all ambition to match his pastoral pipe. A. W. Ward.
At erst
, at first; at the beginning.
– Now at erst
, at this present time.
Chaucer.
Webster 1828 Edition
Erst
ERST
,adv.
1.
First; at first; at the beginning.2.
Once; formerly; long ago.3.
Before; till then or now; hitherto.[This word is obsolete, except in poetry.]