Etymology
1. From Middle English saien, sain, san, secgan, segen, seien, sein, seiȝen, sugen, sægen, ziggen, from Old English seċġan, secgean, secggan, secggean, seggan, sæċġan (“to say, speak”), from Proto-West Germanic *saggjan, from Proto-Germanic *sagjaną (“to say”), from Proto-Indo-European *sokʷ-h₁-yé-, a suffixed o-grade form of *sekʷ- (“to say”).
2. Cognates
3. Cognate with North Frisian sai, seede, sii, sjide, sooi, säie (“to say”), West Frisian sizze (“to say”), Alemannic German ŝchége, ŝchegi, séege, säge, sägä (“to say”), Bavarian sogn, soon, sågn (“to say”), Dutch zeggen (“to say”), German sagen (“to say”), Low German seggen (“to say, tell”), Luxembourgish soen (“to say”), Vilamovian ziöen, zuön, zuø̄n (“to say”), Yiddish זאָגן (zogn, “to say”), Danish sige (“to say”), Elfdalian saja (“to say”), Faroese siga (“to say”), Icelandic segja (“to say”), Jamtish segi (“to say”), Norwegian Bokmål si (“to say”), Norwegian Nynorsk segja, seia, seie (“to say, tell”), Scanian siğa (“to say”), Swedish säga (“to say”); also Cornish hwedhel (“narrative, story, tale”), Irish scéal (“story, tale”), Manx skeeal (“story; news; narrative”), Scottish Gaelic sgeul (“story, tale; information, news”), Welsh chwedl (“story, tale”), hebu (“to say”), Latin inquam (“to say”), Ancient Greek ἐνέπω (enépō), ἐννέπω (ennépō, “tell or tell about; speak”), Latvian sacīt (“to say, tell”), Lithuanian sakyti (“to say, tell”), Bulgarian соча (soča, “to indicate; to point”), Czech sočit (“to blame, hate”), Old Polish soczyć (“to accuse, slander”), Russian сочи́ть (sočítʹ, “to emit (a liquid)”), Ukrainian сочи́ти (sočýty, “to emit (a liquid), exude, ooze; to drain, sap”).
4. The adverb and interjection are from the verb. See: Old English Nouns '
seċġan', Faroese Nouns '
siga', Icelandic Nouns '
segja', Norwegian Bokmål Nouns '
si', Irish Nouns '
scéal', Bulgarian Nouns '
соча'.