To move on to a more advanced or exalted level, to rise in rank or grade; spec. in drug abuse, to progress to a more powerful drug.
| 单词 | θ63938 | 
| 释义 | the world > physical sensation > use of drugs and poison > take drugs			[verb (intransitive)]		 > progress to more powerful drug (1)		 graduate1968 To move on to a more advanced or exalted level, to rise in rank or grade; spec. in drug abuse, to progress to a more powerful drug.  | 
	
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