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board [board 词源字典]: board: [OE] Old English bord had a wide range of meanings, whose two main strands (‘plank’ and ‘border, side of a ship’) reveal that it came from two distinct sources: Germanic *bortham and *borthaz respectively (despite their similarity, they have not been shown to be the same word). Related forms in other Germanic languages that point up the dichotomy are Dutch bord ‘shelf’ and boord ‘border, side of a ship’.

The second, ‘edge’ element of board (which is probably related to border) now survives in English only in seaboard (literally the ‘edge of the sea’) and in variations on the phrase on board ship (whose original reference to the ship’s sides is nowadays perceived as relating to the deck). Board ‘food’ (as in ‘board and lodging’), and hence boarder, are metaphorical applications of board ‘table’.
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gentle: gentle: [13] Expressions like ‘of gentle birth’, and related forms such as gentility [14] and gentleman [13] point up the original link between gentle and ‘family, stock, birth’. The word comes via Old French gentil from Latin gentīlis, a derivative of gēns ‘family, stock’, which in turn goes back to the Indo-European base *gen- ‘produce’ (source of English gene, generate, genitive, etc).

To begin with it meant ‘of the same family’, but by post-classical times it had shifted to ‘of good family’, the sense in which English originally acquired it. Like the closely related generous, it then moved on semantically from ‘well-born’ to ‘having a noble character, generous, courteous’, but interestingly this sense has virtually died out in English (except in such fixed phrases as gentle knight and gentle reader), having been replaced since the 16th century by ‘mild, tender’.

French gentil was reborrowed into English in the 16th century as genteel, in which again connotations of good breeding figure highly. Attempts at a French accent resulted ultimately in jaunty [17], which originally meant ‘wellbred’ or ‘elegant’. The other English descendant of Latin gentīlis is the directly borrowed gentile [14], whose application to ‘non-Jewish people’ comes from its use in the Vulgate, the Latin version of the Bible.
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idle: idle: [OE] ‘Lazy’ is only a secondary meaning of idle. It originally meant ‘useless, worthless’ (as in ‘idle threats’), and the sense ‘lazy’ did not develop until the 13th century (the Old English words for ‘lazy’ were slow and slack). Idle is shared by other West Germanic languages, and its relatives (German eitel ‘vain, futile’ and Dutch ijdel ‘vain, useless, conceited’) point up its original English meaning, but it is not known what its ultimate origins are.
point (v.): late 14c., "indicate with the finger;" c. 1400, "wound by stabbing; make pauses in reading a text; seal or fill openings or joints or between tiles," partly from Old French pointoier "to prick, stab, jab, mark," and also from point (n.).

Mid-15c. as "to stitch, mend." From late 15c. as "stitch, mend;" also "furnish (a garment) with tags or laces for fastening;" from late 15c. as "aim (something)." Related: Pointed; pointing. To point up "emphasize" is from 1934; to point out is from 1570s.