ζυμόω
From LSJ
τὸ πλῆθος οὐκ εὐαρίθμητον ἦν → the crowd wasn't easy to count, the crowd was not small, it was not a small crowd
English (LSJ)
ζύμη)
A leaven, μικρὰ ζύμη ὅλον τὸ φύραμα ζ. 1 Ep.Cor.5.6:—Pass., to be leavened, ferment, LXX Ex.12.34,39, Plu.2.659b, etc.; of digestion, τὰ μέλανα -οῦται Hp.Acut.61; [κοιλίη] ἐζυμωμένη in a ferment, Id.VM11. 2 cause to effervesce, γῆν Gal.10.964, Aët.1 Praef.:—Pass., ζυμουμένη [χύτρα] Alex.124.8.