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moonlighting

British  
/ ˈmuːnˌlaɪtɪŋ /

noun

  1. working at a secondary job

  2. (in 19th-century Ireland) the carrying out of cattle-maiming, murders, etc, during the night in protest against the land-tenure system

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012