Definition
to prepare defenses for yourself against enemy attack in a wartime scenario, such as by creating trenches.
挖壕防御；挖壕防御
They decided to dig in to protect themselves against the approaching storm.
他们决定挖壕沟来保护自己免受即将来临的风暴。
Faced with the enemy's onslaught, they rapidly dug in to strengthen their defenses.
面对敌人的猛攻，他们迅速挖壕沟以加强防御。
The soldiers dug in before the battle to gain cover.
士兵们在战斗前挖壕沟以获得掩护。