Old English seonowe, oblique form of nominative sionu "sinew," from Proto-Germanic *sinwō (source also of Old Saxon sinewa, Old Norse sina, Old Frisian sine, Middle Dutch senuwe, Dutch zenuw, Old High German senawa, German Sehne), from PIE root *sai- "to tie, bind" (source also of Sanskrit snavah "sinew," syati, sinati "to bind;" Avestan snavar, Irish sin "chain;" Hittite ishai-/ishi- "to bind").
"to exert force, physical or moral, upon, either in urging to action or restraining from it," early 14c., constreyen, from stem of Old French constreindre (Modern French contraindre) "restrain, control," from Latin constringere "to bind together, tie tightly, fetter, shackle, chain," from assimilated form of com "with, together" (see con-) + stringere "to draw tight" (see strain (v.)). Related: Constrained; constraining.
1845, "mistress of a castle or household," from French châtelaine "a female castellan; wife of a castellan; mistress of a castle or country house;" fem. of châtelain, from Old French chastelain "owner and lord of a castle, nobleman; keeper of a castle" (Modern French châtelaine), from chastel "castle," from Latin castellum "castle" (see castle (n.)). In fashion, as a type of ornamental belt, from 1851; it is supposed to resemble a chain of keys such as a chatelaine would wear.
Middle English foode, fode, from Old English foda "food, nourishment; fuel," also figurative, from Proto-Germanic *fodon (source also of Swedish föda, Danish föde, Gothic fodeins), from Germanic *fod- "food," from PIE *pat-, extended form of root *pa- "to feed."
Food chain is by 1915. Food poisoning attested by 1864; food processor in the kitchen appliance sense from 1973; food stamp (n.) is from 1962.
"to remove impediments to the movement or progress of, accelerate the motion or progress of, hasten, quicken," 1610s, from Latin expeditus, past participle of expedire "extricate, disengage, liberate; procure, make ready, put in order, make fit, prepare; explain, make clear," literally "free the feet from fetters," hence to liberate from difficulties, from ex "out" (see ex-) + *pedis "fetter, chain for the feet," related to pes (genitive pedis) "foot" (from PIE root *ped- "foot"). Compare Greek pede "fetter." Related: Expedited; expediting.