ὑποσπάω · hypospaō — LSJ
draw away from under
draw away from under, στρώματα D. 24.197; τὰ σκολύθριά τινων ὑ. Pl. Euthd. 278b; τὸν κίονα Arist. Ph. 255b25; ὑ. τινὰ ἐκ τῶν ποδῶν, i. e. trip him up, Luc. Asin. 44, cf. Plu. Vit.pud. 2.535f.
2 draw off, reduce
draw off, τὴν ὑποστάθμην Protagorid. 4; τὸ πῦρ Dsc. 1.30; ὑ. τῆς ποσότητος τοῦ γάλακτος reduce the babyʼs ration of milk, Sor. 1.116.
II withdraw secretly, filch away, withdrew, secretly, to draw oneʼs skirts from under one, to be withdrawn
metaph., withdraw secretly, filch away, ποίμνης νεογνὸν θρέμμʼ ὑποσπάσας E. El. 495; ὑπέσπασεν φυγῇ πόδα withdrew his foot secretly, stole away, Id. Ba. 436:—Med. ὑποσπάσασθαι in X. Eq. 7.8 is (prob.) to draw oneʼs skirts from under one, of a horseman after mounting:—Pass., to be withdrawn, Arist. Somn.Vig. 457b24.
2 refuse
εἰπεῖν ὑ. refuse to say, Phld. Lib. p.23 O.