ὑποκάθ-ημαι · hypokath-ēmai — LSJ
to be seated down in, station oneself
to be seated down in a place, station oneself there, ἐν ταύτῃ τῇ πόλι Hdt. 7.27.
2 sit below, to be placed under
sit below, τινι Philostr. VA 3.16; to be placed under, ὄμμα ὑ. τῇ ὀφρύϊ ib. 8.
II lie in ambush, insidious, fundamental
lie in ambush, Str. 15.1.42: metaph., Philostr. VA 7.14; ὑποκαθήμενον ὁρᾶν to have an insidious look, Id. Im. 2.18; but also ἡ -καθημένη ἀοριστία the fundamental indeterminacy, Carneisc. Herc. 1027.14.
2 lie in wait for, lurk
c. acc. pers., lie in wait for, τὸν βάρβαρον Hdt. 8.40, cf. Philostr. VS 2.2, Her. 2.11: metaph., φθόνος ὑ. τινά Id. VS 2.26.3: abs., lurk, Plu. Vind. 2.556b: c. dat., ὑποκαθημένης αὐτῷ τῆς ὀργῆς Plb. 4.29.7.
III sit idle
sit idle, D.H. 11.37.