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implement: implement: [15] The idea underlying implement is of ‘filling up’. It comes ultimately from Latin implēre, a compound verb formed from the intensive prefix in- and plēre ‘fill’ (as in English complete). This originally meant ‘fill up’, and hence ‘fulfil’, but in post-classical times, under the influence of implicāre (source of English employ) it came to mean ‘use, employ’, and so the derived plural noun implēmenta denoted ‘things used, equipment’.

It was originally used in the plural in English too, and it was not until the 16th century that the singular ‘tool’ emerged. The original Latin sense ‘fulfil’ is preserved much more closely in the verb implement, which was an independent and considerably later introduction, first recorded in Scottish English in the 19th century. (From the same source come English complement and supplement.)
=> complement, complete, supplement
case (n.2): "receptacle," early 14c., from Anglo-French and Old North French casse (Old French chasse "case, reliquary;" Modern French châsse), from Latin capsa "box, repository" (especially for books), from capere "to take, hold" (see capable).

Meaning "outer protective covering" is from late 14c. Also used from 1660s with a sense "frame" (as in staircase, casement). Artillery sense is from 1660s, from case-shot "small projectiles put in cases" (1620s). Its application in the printing trade (first recorded 1580s) to the two trays where compositors keep their types in separate compartments for easy access led to upper-case letter for a capital (1862) and lower-case for small letters.
"The cases, or receptacles, for the type, which are always in pairs, and termed the 'upper' and the 'lower,' are formed of two oblong wooden frames, divided into compartments or boxes of different dimensions, the upper case containing ninety-eight and the lower fifty-four. In the upper case are placed the capital, small capital, and accented letters, also figures, signs for reference to notes &c.; in the lower case the ordinary running letter, points for punctuation, spaces for separating the words, and quadrats for filling up the short lines." ["The Literary Gazette," Jan. 29, 1859]
comply (v.): early 14c., "to fulfill, carry out," from Old French compli, past participle of complir "to accomplish, fulfill, carry out," from Vulgar Latin *complire, from Latin complere "to fill up" (see complete (adj.)). Meaning influenced by ply (v.2). Sense of "to consent" began c. 1600 and might have been a reintroduction from Italian, where complire had come to mean "satisfy by 'filling up' the forms of courtesy."
implement (n.): mid-15c., from Late Latin implementem "a filling up" (as with provisions), from Latin implere "to fill," from assimilated form of in- "into, in, on, upon" (see in- (2)) + plere "to fill" (see pleio-). Sense of "tool" is 1530s, from notion of things provided to do work, that which "fills up" or "completes" a household (c. 1500).
pointing (n.): "the filling up of exterior faces of joints in brickwork," late 15c., verbal noun from point (v.). Meaning "action of indicating with the finger, etc." is from 1550s.
silly (adj.): Old English gesælig "happy, fortuitous, prosperous" (related to sæl "happiness"), from Proto-Germanic *sæligas (cognates: Old Norse sæll "happy," Old Saxon salig, Middle Dutch salich, Old High German salig, German selig "blessed, happy, blissful," Gothic sels "good, kindhearted"), from PIE *sele- "of good mood; to favor," from root *sel- (2) "happy, of good mood; to favor" (cognates: Latin solari "to comfort," Greek hilaros "cheerful, gay, merry, joyous").
This is one of the few instances in which an original long e (ee) has become shortened to i. The same change occurs in breeches, and in the American pronunciation of been, with no change in spelling. [Century Dictionary]
The word's considerable sense development moved from "happy" to "blessed" to "pious," to "innocent" (c. 1200), to "harmless," to "pitiable" (late 13c.), "weak" (c. 1300), to "feeble in mind, lacking in reason, foolish" (1570s). Further tendency toward "stunned, dazed as by a blow" (1886) in knocked silly, etc. Silly season in journalism slang is from 1861 (August and September, when newspapers compensate for a lack of hard news by filling up with trivial stories). Silly Putty trademark claims use from July 1949.