Definition of rule of engagement in English:

rule of engagement

Syllabification: rule of en·gage·ment

Entry from US English dictionary

(abbreviation: ROE)

noun

(usually rules of engagement)
A directive issued by a military authority specifying the circumstances and limitations under which forces will engage in combat with the enemy.

Definition of rule of engagement in:

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Word of the day internecine
Pronunciation: ˌɪntəˈniːsʌɪn
adjective
destructive to both sides in a conflict