Forþ-gestrangian

According to the Old English Dictionary:

forþ-gestrangian

p. ode, ade; pp. od, ad To make very strong, strengthen much; confortāre :-- Ofer me syndon, ða ðe me éhton, forþgestrangad confortāti sunt sŭper me qui me persequuntur, Ps. Th. 68, 5. forþ-gestrangian