Synonyms for Flaring (same or very similar meaning)
WordNet sense 1 (having a gradual increase in width):
flaredWordNet sense 2 (becoming greater or larger):
increasingWordNet sense 3 (streaming or flapping or spreading wide as if in a current of air):
flying, aflare, wavingWordNet sense 4 (in motion):
movingFrom the ODE community, based on WordNetadd/edit