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Is it ensure, insure, or assure?
(of an electrical switch, button, etc) having an `on' position and an `off' position
existing at times and not at others; discontinuous:
an on-off relationship
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
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