What's the difference between i.e. and e.g.?
c.1200, "acute bodily or mental suffering," from Old French anguisse, angoisse "choking sensation, distress, anxiety, rage," from Latin angustia (plural angustiae) "tightness, straitness, narrowness;" figuratively "distress, difficulty," from ang(u)ere "to throttle, torment" (see anger (v.)).
early 14c., intransitive and reflexive; mid-14c., transitive, from Old French anguissier (Modern French angoisser), from anguisse (see anguish (n.)). Related: Anguished; anguishing.