scorched earth policy

noun
🔊/ˌskɔːtʃt ˈɜːθ pɒləsi/
🔊/ˌskɔːrtʃt ˈɜːrθ pɑːləsi/
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  1. (in a war) a policy of destroying anything in a particular area that may be useful to the enemy(战争中的)焦土政策