Directed, occurring, or taking place, alternately upward and downward.
| 单词 | θ106117 | 
| 释义 | the world > movement > motion in specific manner > alternating or reciprocating motion > 			[adjective]		 > up-and-down (2)		 up and down1616 Directed, occurring, or taking place, alternately upward and downward. pump-handle1820 attributive. Applied to action or movement resembling the working of the handle of a pump. | 
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