ERST Meaning of ERST in English /errst/ , adv. Archaic.before the present time; formerly. [ bef. 1000; ME erest, OE aerest (c. OHG erist, G erst ), equiv. to aer ERE + -est -EST 1 ] Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012