billy-o      
adverb UK old-fashioned informal uk/ˈbɪl.i.əʊ/ us/ˈbɪl.i.oʊ/
like billy-o 许多;很快;猛烈地
a lot or very quickly, strongly, etc.
  We worked like billy-o to get it finished. 我们拼命工作争取完成任务。 
 
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