The headword is the future indicative active, second person singular, of the verb paraba/llw; cf. pi 270, pi 271, pi 272, pi 273, pi 275, pi 277, pi 278, pi 279, pi 280, pi 281, pi 513, and see generally LSJ s.v. (Web address 1) It is taken to be quoted from Proverbs 2.2 LXX, where it is twice used in the sense reflected in the translation of the headword given here: kai\ parabalei=s kardi/an sou ei)s su/nesin, parabalei=s de\ au)th\n ei)s nouqe/thsin tw=| ui(w=| sou ("you will apply your heart to understanding, and you will apply it toward the admonishment of your son.") This phrase is also quoted by Clement of Alexandria, Stromata 1.1.2.
[1] The first gloss is the same form of the verb parati/qhmi, I place beside; see generally LSJ s.v. The second gloss is the same form of the verb o(moio/w, I make like; see generally LSJ s.v. The third gloss is the same form of the verb e)pifoita/w, I visit. The headword is identically glossed in Photius' Lexicon (pi193 Theodoridis) and Lexica Segueriana 328.19; cf. Hesychius, ps.-Zonaras 1519.12, and Bekker (below) 112.32.