1: φράσσω
(Strong's #5420 — Verb — phrasso — fras'-so )

"to fence in" (akin to phragmos, "a fence"), "close, stop," is used (a) metaphorically, in Romans 3:19 , of "preventing" all excuse from Jew and Gentile, as sinners; in 2—Corinthians 11:10 , lit., "this boasting shall not be stopped to me;" Passive Voice in both; (b) physically, of the mouths of lions, Hebrews 11:33 (Active Voice).

2: συνέχω
(Strong's #4912 — Verb — sunecho — soon-ekh'-o )

"to hold together," is rendered "stopped (their ears)" in Acts 7:57 . See HOLD.

3: ἐπιστομίζω
(Strong's #1993 — Verb — epistomizo — ep-ee-stom-id'-zo )

"to stop the mouth," Titus 1:11 : see MOUTH , B.