Definition: place a limit on the number of
Definition: restrict or confine, "I limit you to two visits to the pub a day"
Definition: put down by force or intimidation
Usage: The government quashes any attempt of an uprising; China keeps down her dissidents very efficiently; The rich landowners subjugated the peasants working the land
Definition: come down on or keep down by unjust use of one's authority
Usage: The government oppresses political activists