Answer: andon

AnswerCrossword Clue
ANDON

Off ..: sporadically

ANDON

Off ... (intermittently)

ANDON

On ... (at great length).

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