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expatiate (v.): 1530s, "walk about, roam freely," from Latin expatiatus/exspatiatus, past participle of expatiari/exspatiari "wander, digress, wander from the way; spread, extend," from ex- "out" (see ex-) + spatiari "to walk, spread out," from spatium (see space (n.)). Meaning "talk or write at length" is 1610s. Related: Expatiated; expatiating.
straggle (v.): early 15c., "to wander from the proper path, stray, to rove from one's companions," perhaps from a Scandinavian source (compare dialectal Norwegian stragla "to walk laboriously"), or a frequentative of Middle English straken "to move, go." Specifically of soldiers, "be dispersed, be apart from the main body," from 1520s. Related: Straggled; straggling.
stray (v.): c. 1300, a shortening of Old French estraier "wander about, roam, drift, run loose," said of animals, especially a horse without a master, also of persons, perhaps literally "go about the streets," from estree "route, highway," from Late Latin via strata "paved road" (see street). On another theory, the Old French word is from Vulgar Latin *estragare, a contraction of *estravagare, representing Latin extra vagari "to wander outside" (see extravagant). Figurative sense of "to wander from the path of rectitude" is attested from early 14c. Related: Strayed; straying.