One of the category of Suda entries designed to show which grammatical case a verb governs; in this instance the genitive.
For this deliberative future see tau 430, sigma 1639, pi 1321. For the question of whether to assign this future tense to tugxa/nw or teu/xw see these entries and, more particularly, tau 435. For the sense in this compound of happening on or finding a stroke of luck, see the related noun e)pi/teugma (epsilon 2673; cf. kappa 2756, kappa 2772).