Geology. To double up (strata). Also intransitive for reflexive. To become doubled up.
| 单词 | θ5135 | 
| 释义 | the world > the earth > structure of the earth > formation of features > tectonization or diastrophism > 			[verb (intransitive)]		 > fold (1)		 fold1857 Geology. To double up (strata). Also intransitive for reflexive. To become doubled up. | 
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