τῐταίνω · titainō — LSJ
stretch, τόξα τιταίνων bending his bow, Il. 8.266; ἕτερος δʼ ἐπὶ πάσι (παισὶ Pap.; v. πᾶσις) ποικίλον τόξον τιταίνει B. 9.43; so in Med., ἐτιταίνετο καμπύλα τόξα Il. 5.97, cf. Od. 21.259; Τυδεΐδῃ ἔπι τόξα τιταίνετο Il. 11.370; φόρμιγγα τιτηνάμενος having tuned my harp, Orph. A. 251 codd.; hence τιταίνει . . νόμον plays a tune on the strings, Ar. Fr. 671 (troch.).
stretch out, περὶ μέσσῳ χεῖρε τιτήνας Il. 13.534; χρύσεια πατὴρ ἐτίταινε τάλαντα held them out, 8.69; προπάροιθε θρόνων ἐτίταινε τραπέζας Od. 10.354:—Pass., extend, τῇ καὶ τῇ D.P. 637, cf. 92, 116, al.
draw at full stretch, ἅρμα τ. Il. 2.390; βόε οἴνοπε πηκτὸν ἄροτρον . . τιταίνετον 13.704: abs., τιταίνετον haste along, 23.403.
Pass., strain or exert oneself, chiefly in part., ἂψ ὤσασκε τιταινόμενος with vehement effort, Od. 11.599; γυῖα τιταινόμενος APl. 16.105; of a horse galloping, τιταινόμενος πεδίοιο stretching over the plain, Il. 22.23; ἵππος ἄνακτα ἕλκῃσιν πεδίοιο τιταινόμενος σὺν ὄχεσφι 23.518; of birds, τιταινομένω πτερύγεσσιν Od. 2.149; of a man running at full speed, Hes. Sc. 229; of rivers, τ. κατʼ ὄρεσφι Opp. H. 1.22.
in Hp., Aret., and late Ep., strain, ὄμμα τ. Man. 4.496, etc.; τ. ὄμμα εἴς τι Nonn. D. 7.283; τ. ψιθύρισμα whistle loudly, ib. 1.31, etc.:—Pass., to be strained or stretched, as in convulsions, Hp. Epid. 5.47, Nic. Th. 722, Aret. CA 1.5, etc.: metaph., ἡ ὀδύνη τ. becomes intense, Hp. Mul. 2.134 (unless τὰ σκέλεα is the subject).
Hes. attempts to derive the name Τιτῆνες from τῑταίνω (lengthd. ad hoc, but retaining its usual sense) and at the same time from τῐσις, Th. 207 sqq.: v. Τιτάν.