Answer: andon

AnswerCrossword Clue
ANDONOn ... (never ending)
ANDONOn ....: endless
ANDONOff ..... (occasionally)
ANDON"... that note ..."
ANDONOff -- (sporadically)
ANDON"... the seventh day ..."
ANDONIntermittently, after "off"
ANDONOff ...
ANDONOff ... (occasionally)
ANDONOff ... (sporadically)
ANDONOff ..: sporadically
ANDONGo on ...
ANDONOff ... (intermittently).
ANDONGo on ....
ANDONOff ....
ANDONOn ... (unendingly).
ANDONOn ... (continuously).
ANDONOn ... (continually).
ANDONOn ... (at great length).
ANDONOff ... (intermittently)