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advantage [advantage 词源字典]: advantage: [14] Advantage comes from Old French avantage, which was based on avant ‘before’; the notion behind its formation was of being ahead of others, and hence in a superior position. As with advance, the intrusive -dbecame established in the 16th century, on the analogy of words genuinely containing the Latin prefix ad-. The reduced form vantage actually predates advantage in English, having entered the language via Anglo-Norman in the 13th century.
[advantage etymology, advantage origin, 英语词源]
groundsel: groundsel: [OE] The -sel of groundsel represents Old English swelgan ‘swallow’ (ancestor of modern English swallow), and if ground- genuinely represents ground, then groundsel would mean etymologically ‘groundswallower’ – presumably a reference to its rapid and invasive growth. However, in early texts the form gundæswelgiæ appears, the first element of which suggests Old English gund ‘pus’. If this is the word’s true origin, it would mean literally ‘pus-swallower’, an allusion to its use in poultices to absorb pus, and groundsel would be a variant introduced through association with ground.
=> swallow
viking: viking: [19] There are two competing theories as to the origin of the word viking. If its ancestry is genuinely Scandinavian (and Old Norse víkingr is first recorded in the 10th century), then it was presumably based on Old Norse vík ‘inlet’, and it would denote etymologically ‘person who lives by the fjords’ – a logical enough notion. However, earlier traces of the word have been found in Old English and Old Frisian, from around the 8th century, which suggests the alternative theory that it may have been coined from Old English wīc ‘camp’ (ancestor of the -wick, -wich of English place-names).

On this view, the term originated as a word used by the Anglo-Saxons for the Norse raiders, who made temporary camps while they attacked and plundered the local populace. It was introduced into modern English at the start of the 19th century as an antiquarian’s or historian’s term.
delicate (adj.): late 14c., "self-indulgent, loving ease; delightful; sensitive, easily hurt; feeble," from Latin delicatus "alluring, delightful, dainty," also "addicted to pleasure, luxurious, effeminate;" which is of uncertain origin; related by folk etymology (and perhaps genuinely) to deliciae "a pet," and delicere "to allure, entice" (see delicious). Meaning "easily broken" is recorded from 1560s.
genuine (adj.): 1590s, "natural, not acquired," from Latin genuinus "native, natural, innate," from root of gignere "beget" (see genus), perhaps influenced in form by contrasting adulterinus "spurious." [Alternative etymology is from Latin genu "knee," from a supposed ancient custom of a father acknowledging paternity of a newborn by placing it on his knee.] Meaning "really proceeding from its reputed source" is from 1660s. Related: Genuinely; genuineness.
mauvaise foi: "In the existentialist philosophy of Sartre: the self-deception practised by a person who wishes to avoid absolute responsibility for his or her own actions by not recognizing that human beings have free will and that no relationship is genuinely mutual. Also (in extended use): bad faith, disingenuousness", 1940s. From French mauvaise foi, lit. ‘bad faith’ from mauvaise, feminine of mauvais bad + foi faith.