Etymology
Advertisement
dub (v.1)

"give a name to," originally "make a knight," from late Old English dubbian "knight by ceremonially striking with a sword" (11c.), a word perhaps borrowed from Old French aduber "equip with arms, adorn" (11c.) which is of uncertain origin, probably Germanic, but there are phonetic difficulties. Meaning "provided with a name" is from 1590s. Related: Dubbed; dubbing.

Related entries & more 
Advertisement
dub (v.2)

"add or alter sound on film," 1929, shortening of double (v.); so called because it involves making an additional recording of voices and combining it with the soundtrack. The type of re-mixed reggae music was so called from 1974, probably for the same reason. Related: Dubbed; dubbing.

Related entries & more 
overdub (v.)

"add (extraneous sounds) to a recording," 1954, from over- + dub (v.). As a noun (over-dub) from 1953. Related: Overdubbed; overdubbing.

Related entries & more 
rub-a-dub (n.)
1787, echoic of the sound of a drum.
Related entries & more 
knight (v.)
"to make a knight of (someone), to dub or create a knight," early 13c., from knight (n.). Related: Knighted; knighting.
Related entries & more 
Advertisement
dubitable (adj.)

"liable to be doubted," 1620s, from French dubitable, from Latin dubitabilis "doubtful," from dubitare "hesitate, doubt" (see doubt (v.)). Related: Dubitably.

Related entries & more 
dubiety (n.)

"doubtfulness, dubiousness," 1650s, from Late Latin dubietas "doubt, uncertainty," from Latin dubius "vacillating, fluctuating," figuratively "wavering in opinion, doubting" (see dubious). Earlier in the same sense were dubiosity (1640s), dubiousness (1650s); also see dubitation.

Ignorance is the mother of two filthy daughters; the first daughter of Ignorance is called dubiety, or doubtfulnesse, which is a continual wavering in opinion; a knowing man hath a fixt spirit, and settled judgement, but an ignorant man is a double-minded man, though he be never so resolute and wilful in his opinions. [W. Geering, "The Mischiefes and Danger of the Sin of Ignorance," London, 1659]
Related entries & more 
Dubai 
Gulf coast emirate, of uncertain origin.
Related entries & more 
Dubonnet (n.)

sweet French aperitif, by 1901, trademark name, from the name of a family of French wine merchants.

Related entries & more 
dubitation (n.)

early 15c., dubitacioun, "act or state of doubting," from Old French dubitation (13c.) and directly from Latin dubitationem (nominative dubitatio) "uncertainty, doubt," noun of state from past-participle stem of dubitare "to waver in opinion, be uncertain, doubt, question" (related to dubius "uncertain;" see dubious).

Related entries & more