συντίθημι fut. -θήσω to put together, Hdt., Xen., etc.; σ. ἄρθρα στόματος to close the lips, Eur. in Arithm. to add together, Hdt., Eur., etc.: also συντιθεὶς γέλων adding laughter, Soph. to put together, of builders, Thuc., Xen. to construct, frame, build, Hdt.:— σ. τι ἀπό or ἔκ τινος to compose or make one thing of another, Hdt. to construct or frame a story, Eur., Ar., etc.:—of an author, to compose, Thuc. to frame, devise, contrive, ὁ συνθεὶς τάδε the framer of this plot, Soph.; σ. ψευδεῖς αἰτίας Dem. to put together, take in, comprise, Eur.; ἐν βραχεῖ ξυνθεὶς λόγῳ putting things shortly together, Soph. Mid. συντίθεμαι, to put together for oneself, i. e. to observe, take heed to, σύνθετο βουλήν, ἀοιδήν Hom.; and, simply, to perceive, hear, ὅπα σύνθετο Od.: absol., σύνθεο take heed, Hom. to set in order, organise, Xen. to conclude, form, ἄνδρεσσι κακοῖς συνθέμενοι φιλίην Theogn.; συντίθεσθαι συμμαχίην Hdt.; σ. ναῦλον to agree upon the fare, Xen.:—Pass., τοῦ συντεθέντος χρόνου at the time agreed upon, Plat. c. inf. to covenant or agree to do, Hdt., Thuc. absol. to make a covenant, Hdt., Xen.