Strong’s Greek
G4963 — sustrophe
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
συστροφή
sustrophe — pronounced soos-trof-ay'
from 4962; a twisting together, i.e. (figuratively) a secret coalition, riotous crowd:--+ band together, concourse. see GREEK for 4962
2 occurrences in the KJV.
Acts 19:40
For we are in danger to be called in question for this day’s uproar, there being no cause whereby we may give an account of this concourse.
Acts 23:12
And when it was day, certain of the Jews banded together, and bound themselves under a curse, saying that they would neither eat nor drink till they had killed Paul.