Letters that make erst
s, e, r, t are letters that make 'erst'
verst is a word created by adding a letter to 'erst'
1 possible definitions for 'erst'
Under this definition, erst is an adjective and has the following properties:
once, formerly, at one time, erstwhile have the same meaning as 'erst'
"at one time he loved her", "her erstwhile writing", "she was a dancer once"