groundswell

noun

1. a broad, deep swell or rolling of the sea, due to a distant storm or gale.
2. any surge of support, approval, or enthusiasm, especially among the general public: a groundswell of political support for the governor.

noun

1. a considerable swell of the sea, often caused by a distant storm or earthquake or by the passage of waves into shallow water
2. a strong public feeling or opinion that is detectable even though not openly expresseda groundswell of discontent