Definitions for on and off
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Princeton's WordNet
off and on, on and off(adverb)
not regularly
"they phone each other off and on"
Wiktionary
on and off(Adverb)
Intermittently.
Citation
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"on and off." Definitions.net. STANDS4 LLC, 2013. Web. 19 May 2013. <http://www.definitions.net/definition/on and off>.

