Several generous users on ELU recommend the use of OED for etymology, but does the OED it truly helps? I'll exemplify the two kinds of problems that I faced; please feel free to moot any others.
Thanks to user 'tchrist' below, I now know about OED's Key to symbols and other conventions.
anticipate, v. Etymology: < anticipate adj., or on analogy of verbs so formed.
Compare French anticip-er ( < Latin) found in 14th cent.
† anˈticipate, adj.
Etymology: < Latin anticipāt-us, past participle of anticipā-re, prop. antecipā-re, < ante before + -cipāre, deriv. < cap-ĕre (in compound -cip-ĕre) to take.
Problem 1: This only presents the facts, but no explanation or reasoning 'between the lines'. I admit that I'm unversed in linguistics or languages, but at least Etymonline does try.
Etymology: Cognate with or formed similarly to Old Frisian a-jēn , Old Dutch angegin , angegen , anegeginne , Old Saxon angegin , Old High German angegini
< the Germanic base of on- prefix + a Germanic base either identical to or related to that of gain adj. (compare gain- prefix).