avail (v.) 2
be of use to, help, advantage
1H6 I.i.47 [Bedford to all] we'll offer up our arms, / Since arms avail not, now that Henry's dead
1H6 III.i.181 [Gloucester to King] Now will it best avail your majesty / To cross the seas
Luc 1273 [Lucrece to Maid, of the Maid weeping] it small avails my mood