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believe [believe 词源字典]: believe: [OE] Believing and loving are closely allied. Late Old English belēfan took the place of an earlier gelēfan ‘believe’ (with the associative prefix ge-), which can be traced back to a prehistoric West and North Germanic *galaubjan (source also of German glauben ‘believe’). This meant ‘hold dear, love’, and hence ‘trust in, believe’, and it was formed on a base, *laub-, which also produced, by various routes, English love, lief ‘dear’, leave ‘permission’, and the second element of furlough.
=> furlough, leave, lief, love[believe etymology, believe origin, 英语词源]
relieve: relieve: [14] Relieve goes back via Old French relever to Latin relevāre ‘raise again’, a compound verb formed from the prefix re- ‘again’ and levāre ‘raise’ (source of English elevate, levy, etc). Its metaphorical extension to ‘lighten, alleviate’ began in Latin. The derived noun relief reached English in two phases. First, in the standard sense ‘easing, alleviation’, via Anglo-Norman relef in the 14th century; and then, in the 17th century, via French from Italian relievo in the sense ‘raised area in a design’ – a return to the etymological meaning ‘raise’.
=> elevate, levy, relevant
believe (v.): Old English belyfan "to believe," earlier geleafa (Mercian), gelefa (Northumbrian), gelyfan (West Saxon) "believe," from Proto-Germanic *ga-laubjan "to believe," perhaps literally "hold dear, love" (cognates: Old Saxon gilobian "believe," Dutch geloven, Old High German gilouben, German glauben), ultimately a compound based on PIE *leubh- "to care, desire, love" (see belief).

Spelling beleeve is common till 17c.; then altered, perhaps by influence of relieve, etc. To believe on instead of in was more common in 16c. but now is a peculiarity of theology; believe of also sometimes was used in 17c. Related: Believed (formerly occasionally beleft); believing. Expression believe it or not attested by 1874; Robert Ripley's newspaper cartoon of the same name is from 1918. Emphatic you better believe attested from 1854.
believer (n.): "one who has faith in religion," 1540s, agent noun from believe.
disbelieve (v.): 1640s; see dis- + believe. Related: Disbelieved; disbelieving; disbeliever.
make-believe (n.): "pretence," 1811, from make (v.) + believe. As an adjective by 1824.
relieve (v.): late 14c., "alleviate (pain, etc.), mitigate; afford comfort; allow respite; diminish the pressure of," also "give alms to, provide for;" also figuratively, "take heart, cheer up;" from Old French relever "to raise, relieve" (11c.) and directly from Latin relevare "to raise, alleviate, lift up, free from a burden," from re-, intensive prefix (see re-), + levare "to lift up, lighten," from levis "not heavy" (see lever).

The notion is "to raise (someone) out of trouble." From c. 1400 as "advance to the rescue in battle;" also "return from battle; recall (troops)." Meaning "release from duty" is from early 15c. Related: relieved; relieving.
reliever (n.): late 15c., agent noun from relieve. Baseball sense ("relief pitcher") is attested by 1945.
unbeliever (n.): "one who does not believe in any given religion," 1520s, from un- (1) "not" believer. Old English had ungelifend in this sense.
unrelieved (adj.): "monotonous, unvarying," 1764, from un- (1) "not" + past participle of relieve (v.).