ὑποσῡρ-ίζω · hyposyr-izō — LSJ
whistle, rustle, αἰθὴρ . . πτερύγων ῥιπαῖς ὑ. A. Pr. 126 (anap.); make a whistling sound, ἡ ἀρτηρία . . ὑπεσύριζε Hp. Epid. 7.25, cf. 7, al.; of snakes, Id. Ep. 15, Ael. NA 2.7.
make a signal by whistling, τινι Aristaenet. 2.4.