n.
1.a policy of creating strategic alliances in order to check the expansion of a hostile power or ideology or to force it to negotiate pecefully
2.(physics) a system designed to prevent the accidental release of radioactive material from a reactor
3.(military) the act of containing something or someone
Idiom of the Day
make a killing
to make a large amount of money
The woman made a killing on the real estate market before she retired.