Strong's G1993 — ἐπιστομίζω (verb)
epistomizo (ep-ee-stom-id'-zo) v.
1. to put something over the mouth
2. (figuratively) to silence
[from G1909 and G4750]
KJV: stop mouths 
Root(s): G1909, G4750 
Hebrew root: στόμα
Occurrences: 1