Escalation
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Escalation is the phenomenon of something getting worse step by step, for example a quarrel, or, notably, military presence and nuclear armament during the Cold War. (Compare to escalator, a device that lifts something to a higher level.)
It is also used in psychology to describe a change in behaviour usually from stable or acceptable towards unstable or unacceptable.
Links
- Herman Kahns escalation ladder (http://www.texaschapbookpress.com/magellanslog41/escalation.htm)