be a sign of (verb) signify: mean, indicate
Sinonime: act reciprocally,
alter, blow hot and cold,
change, come and go,
exchange, fill in for, fluctuate,
follow, follow in turn,
interchange, intersperse,
oscillate,
relieve, rotate, seesaw,
shift, shilly-shally,
substitute,
sway, vacillate,
vary,
waver, yo-yo
Antonime: continue