A.make a noise by closing the mouth and forcing the breath through the nostrils, snort, esp. from passion, A.Fr.461.
2. make mouths, sneer, “χείλεσι μυχθίζοισα” Theoc.20.13; “σιμὰ σεσηρὼς μυχθίζεις” AP5.178 (Mel.); “μ. καὶ διαψιθυρίζω” Plb.15.26.8.