huddle up like a turtle drawing in its head and legs ; withdraw into passive defense ; hole up
The enemy was holed up in a few isolated strongholds.
敌人龟缩在几个孤立的据点里。
youdao
《新英汉大辞典》
龟缩，读音为guī suō，汉语词语，形容物质（物体）的缩退状态（收缩）（缩进）。
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