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οἶδα know, εὖ οἶδα I know well; εὖ ἴσθι be assured: often c. acc. rei, νοήματα οἶδε, μήδεα οἶδε he is versed in counsels, Hom.; with neut. Adjs., πεπνυμένα, φίλα, ἀθεμίστια εἰδώς id=Hom.; also c. gen., τόξων εὖ εἰδώς cunning in the use of the bow; οἰωνῶν σάφα εἰδώς Od.: —χάριν εἰδέναι τινί to acknowledge a debt to another, thank him, Il., etc.:—the Imperat. in protestations, ἴστω Ζεὺς αὐτός be Zeus my witness, id=Il.; doric ἴττω Ζεύς, ἴττω Ar.: —εἰδώς absol. one who knows, εἰδυίηι πάντ᾽ ἀγορεύω Il.; ἰδυίηισι πραπίδεσσι with knowing mind, id=Il.
2.c. inf. to know how to do, id=Il., attic
3.with the part. to know that so and so is the case, ἴσθι μοι δώσων know that thou wilt give, Aesch.; τὸν Μῆδον ἴσμεν ἐλθόντα Thuc.
4.οὐκ οἶδα εἰ, I know not whether, expresses disbelief, like Lat. nescio an non, οὐκ οἶδ᾽ ἂν εἰ πείσαιμι Eur.
5.οἶδα or ἴσθι are often parenthetic, οἶδ᾽ ἐγώ id=Eur.; οἶδ᾽ ὅτι, οἶσθ᾽ ὅτι, ἴσθ᾽ ὅτι, πάρειμι Soph.; so, εὖ οἶδ᾽ ὅτι Dem.: —in Trag. also, οἶσθ᾽ δρᾶσον; equivalent to δρᾶσονοἶσθ᾽ ; do— know'st thou what? i. e. make haste and do; οἶσθ᾽ ὡς ποίησον, etc.

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