The adjective 'torn-up' is a compound formed from the past participle of the verb 'tear' and the adverbial particle 'up'. The verb 'tear' originates from the Old English teran, meaning to pull apart by force, which has cognates across Germanic languages. The particle 'up', from Old English up, adds a sense of completion or thoroughness to the action. When combined, the literal sense of something being completely ripped apart evolved metaphorically to describe a state of profound emotional distress, as if one's feelings have been violently disrupted. This figurative extension leverages the physical imagery of destruction to convey intense psychological upheaval.

Structure: torn (past participle of tear) + up (particle/adverb) - torn: From Old English teran (to tear, lacerate), of Germanic origin. In this structure, it functions as a past participle. - up: From Old English up, upp, of Germanic origin. In phrasal verb/adjective formations, it often functions as an intensifying or completive particle.