Origins
The word 'grief' encodes one of humanity's oldest metaphors: sorrow as heaviness. Its etymology traces a direct line from physical weight to emotional suffering, beginning with the Proto-Indo-European root *gʷreh₂- (heavy) and arriving in modern English as the name for the deepest form of human anguish.
The PIE root *gʷreh₂- produced Latin 'gravis' (heavy, weighty, serious), which generated the verb 'gravāre' (to weigh down, to burden). From 'gravāre,' Old French developed 'grever' (to burden, to oppress, to cause suffering), and from 'grever' came the noun 'grief' — originally meaning hardship, suffering, or injustice in a general sense, not specifically the sorrow of bereavement.
When 'grief' entered Middle English around 1225, it retained this broad meaning. A medieval 'grief' could be a physical hardship, a legal injustice, a bodily pain, or an emotional sorrow. The narrowing to specifically emotional suffering — and particularly to the anguish of losing someone to death — occurred gradually over the fourteenth and fifteenth centuries. By Shakespeare's time, 'grief' had largely settled into its modern meaning, though he still occasionally used it in the older, broader sense.
Proto-Indo-European Roots
The PIE root *gʷreh₂- produced a remarkable family across the Indo-European languages. In Latin, 'gravis' gave English 'grave' (the adjective meaning serious), 'gravity' (heaviness, seriousness), 'aggravate' (to make heavier or worse), and 'gravid' (heavy with child, pregnant). In Greek, the same root produced 'barýs' (heavy), which through scientific Latin gave English 'barometer' (a device measuring atmospheric pressure, i.e., the weight of air) and 'baritone' (a 'heavy-toned' voice). In Sanskrit, it produced 'guru' (heavy, weighty, and by extension a person of weight or importance — a teacher).
The connection between 'grief' and 'guru' — the deepest sorrow and the honored teacher, both from the same ancient word for 'heavy' — is one of etymology's more poignant discoveries. Weight, in the Indo-European conceptual world, was associated with both suffering and significance. What was heavy mattered; what mattered was heavy.
The verb 'grieve' entered English slightly later than the noun, from Old French 'grever.' The legal term 'grievance' (a cause for complaint, originally a burden or oppression) preserves the older, broader sense of the word family. 'Grievous' (extremely serious, causing grief) maintains the connection between severity and sorrow.
Figurative Development
Modern psychology has given 'grief' a technical dimension it never had before. Elisabeth Kübler-Ross's 'five stages of grief' (1969) — denial, anger, bargaining, depression, acceptance — transformed the word from a description of an emotional state into a framework for understanding a process. The word that began as a metaphor for physical heaviness now names a clinical phenomenon studied by researchers worldwide.