muck in 
phrasal verb with muck verb uk/mʌk/ us/mʌk/
  UK informal      
 一起出力,一起合作;参加
to share the work that needs to be done
  She doesn't mind mucking in with the rest of us when there's work to be done. 当有工作要做时,她不介意和我们大家一起干。 
 
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