استحجر

Also It (clay) became stone: (TA:) or became hard; as when it is made into baked bricks: (Mgh:) or became hard like stone: (A, Msb;) as also تحجّر. (A.)

(assumed tropical:) He became emboldened or encouraged, or he emboldened or encouraged himself, (K TA,) عَلَيْهِ against him. (TA.)