Etymology
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speak (v.)

Old English specan, variant of sprecan "to speak, utter words; make a speech; hold discourse (with others)" (class V strong verb; past tense spræc, past participle sprecen), from Proto-Germanic *sprekanan (source also of Old Saxon sprecan, Old Frisian spreka, Middle Dutch spreken, Old High German sprehhan, German sprechen "to speak," Old Norse spraki "rumor, report"), from PIE root *spreg- (1) "to speak," perhaps identical with PIE root *spreg- (2) "to strew," on notion of speech as a "scattering" of words.

The -r- began to drop out in Late West Saxon and was gone by mid-12c., perhaps from influence of Danish spage "crackle," also used in a slang sense of "speak" (compare crack (v.) in slang senses having to do with speech, such as wisecrack, cracker, all it's cracked up to be). Elsewhere, rare variant forms without -r- are found in Middle Dutch (speken), Old High German (spehhan), dialectal German (spächten "speak").

Not the primary word for "to speak" in Old English (the "Beowulf" author prefers maþelian, from mæþel "assembly, council," from root of metan "to meet;" compare Greek agoreuo "to speak, explain," originally "speak in the assembly," from agora "assembly").

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speak (n.)
c. 1300, "talk, speech," from speak (v.). Survived in Scottish English and dialect, but modern use in compounds probably is entirely traceable to Orwell (see Newspeak).
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spake 
archaic or poetic past tense of speak.
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speakable (adj.)
late 15c., from speak (v.) + -able. Also see unspeakable. Old English had sprecendlic "that should be spoken."
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spoken (adj.)
"uttered, oral" (as opposed to written), 1837, past-participle adjective from speak (v.).
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doublespeak (n.)
1957, from double (adj.) + speak, coined on model of doublethink in Orwell's "Nineteen Eighty-Four" (the language in that book was Newspeak).
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unspeakable (adj.)
c. 1400, "inexpressible," from un- (1) "not" + speakable (see speak (v.)). Meaning "indescribably bad or wicked" is recorded from mid-15c. Related: Unspeakably.
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unspoken (adj.)
late 14c., from un- (1) "not" + past participle of speak (v.). Similar formation in Middle Dutch ongesproken, Middle Low German ungesproken.
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speakeasy (n.)
"unlicensed saloon," 1889 (in the New York "Voice"), from verbal phrase, from speak (v.) + easy (adv.); so called from the practice of speaking quietly about such a place in public, or when inside it, so as not to alert the police and neighbors. The word gained wide currency in U.S. during Prohibition (1920-1932). In early 19c. Irish and British dialect, a speak softly shop meant "smuggler's den."
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speaker (n.)
c. 1300, "one who speaks," agent noun from speak (v.). Similar formation in Old Frisian spreker, Old High German sprahhari, German Sprecher. First applied to "person who presides over an assembly" c. 1400, from similar use in Anglo-French (late 14c.) in reference to the English Parliament; later extended to the U.S. House of Representatives, etc. The electric amplifier so called from 1926, short for loud-speaker.
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