rolling
roll‧ing /ˈrəʊlɪŋ $ ˈroʊ-/
adjective [only before noun]1. rolling hills have many long gentle slopes
2. done or happening regularly over a period of time, not all at once:
We recommend a rolling programme of machine upgrading.
roll‧ing /ˈrəʊlɪŋ $ ˈroʊ-/
adjective [only before noun]1. rolling hills have many long gentle slopes2. done or happening regularly over a period of time, not all at once: