S: (v) check, turn back, arrest, stop, contain, hold back (hold back, as of a danger or an enemy; check the expansion or influence of) "Arrest the downward trend"; "Check the growth of communism in South East Asia"; "Contain the rebel movement"; "Turn back the tide of communism"
S: (v) defend (be on the defensive; act against an attack)
S: (v) prevent, keep (stop (someone or something) from doing something or being in a certain state) "We must prevent the cancer from spreading"; "His snoring kept me from falling asleep"; "Keep the child from eating the marbles"