rum‧bling /ˈrʌmblɪŋ/
noun1. rumblings [plural] remarks that show that people are starting to become annoyed, or that a difficult situation is developing:
rumblings of discontent There have been rumblings about the need for better computers.2. [countable usually singular] a series of long low sounds:
We heard a rumbling behind us. [TahlilGaran] Dictionary of Contemporary English ▲