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1、D-day1918,"datesetforthebeginningofamilitaryoperation,"withDasanabbreviationofday,cf.H-hour,alsofromthesamemilitaryorderofSept.7,1918:"TheFirstArmywillattackatH-HouronD-DaywiththeobjectofforcingtheevacuationoftheSt.Mihielsalient."[FieldOrderNo.8,FirstArmy,A.E.F.]"
2、Theydesignatethedayandhouroftheoperationwhenthedayandhourhavenotyetbeendetermined,orwheresecrecyisessential"[U.S.ArmyCenterofMilitaryHistoryWebsite].NowalmostexclusivelyofJune6,1944.D.D.T.1943,fromdichlorodiphenyltrichlorethane;firstmadeinU.S.byGeigey&Co.D.T.abbre
3、viationofdeliriumtremens(q.v.),attestedfrom1858.dabc.1307,"heavyblowwithaweapon,"fromdabben"tostrike,"perhapsimitative.Modernsenseof"strikewithaslight,quickpressure"developedby1592,infl.byFr.dauber(seedaub).DabhandisBritishslang,1828,fromdab"expert"(1691),saidtobe
4、schoolslang,ofunknownorigin.dabble1557,frequentativeofdab.Originalmeaningwas"wetbysplashing;"modernfig.sensefirstrecorded1625.dachshund1881,fromGer.Dachshund,fromDachs,fromcommonI.E.wordfor"badger"(cf.L.taxus,taxo)+Hund"dog."Probablysocalledbecausethedogswereusedi
5、nbadgerhunts,theirlong,thinbodiesbredtoburrowintosetts.Dacron1951,proprietaryname(reg.U.S.PatentOffice)byE.I.duPontdeNemours&Co.;aninventedword,onthemodelofnylon,etc.dactyl1398,fromGk.dactylos"finger,"ofunknownorigin;themetricaluse(alongsyllablefollowedbytwoshorto
6、nes)isbyanalogywiththethreejointsofafinger.dadrecordedfrom1500,butprobablymucholder,fromchild'sspeech,nearlyuniversalandprobablyprehistoric(cf.Welshtad,Ir.daid,Czech,L.,Gk.tata,Lith.tete,Skt.tatahallofthesamemeaning).Daddylonglegsisfrom1814;daddy-oisfirstrecorded1
7、949,fromboptalk.dada1920,fromFr.dada"hobbyhorse,"child'snonsenseword,selected1916byRomanianpoetTristanTzara,leaderofthemovement,foritsresemblancetomeaninglessbabble."Freedom:DADADADADADA,thehowlofclashingcolors,theintertwiningofallcontradictions,grotesqueries,triv
8、ialities:LIFE."[T.Tzara,"DadaManifesto,"1918]DaedalusfromGk.Daidalos,lit."thecunningworker,"fromdaidallein"toworkartfully."daffodil1548,variantofM.E.aff
