ὑπογελάω
From LSJ
περὶ ἀλόγων γραμμῶν καὶ ναστῶν → on incommensurable lines and solids
English (LSJ)
A laugh a little, smile, Pl.Chrm.162b, Polem.Phgn.19.
German (Pape)
[Seite 1212] (s. γελάω), ein wenig lachen, verstohlen lächeln, Plat. Charm. 162 b.