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| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
An increase in the intensity or geographical scope of a war or diplomatic confrontation. For example, during the Korean War, some Americans urged escalation of the war through bombing of the People's Republic of China.