ἐπισφίγγω

A. bind tight, tighten, κημούς Ph. 1.698; νάρθηκας (splints) Gal. 18(2).398; πέδιλα ἐ. τοὺς πόδας Luc. Am. 41 ; ἐ. τινὰ πήχεσι in the arms, AP 5.242 (Maced.); ἐ. τοὺς ἀναγωγέας tie the shoe-strings tight, Ath. 12.543f; μοσχεύματα Gp. 10.12.3: metaph.,shut up tightly, [θησαυροὺς] κακῶν Ph. 1.108 ; ἐ. τὴν ἀμφισβήτησιν complicate it, opp. λύειν, S.E. M. 2.96 ; also ἐ. τὴν νήτην screw it tighter, tune the instrument, Ael. VH 9.36 : metaph., 'screw up', intensify, ὀδύνας (ὠδίνας cod.) Ph. 1.680.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project