We found one dictionary that defines the word heavy swells:

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1. heavy swells: Vocabulary.com

(Note: See heavy_swell as well.)

Definitions from WordNet (heavy swell) ▸ noun:  a broad and deep undulation of the ocean ▸ Also see heavy_swell ▸ Words similar to heavy swells ▸ Usage examples for heavy swells ▸ Idioms related to heavy swells ▸ Wikipedia articles (New!) ▸ Words that often appear near heavy swells ▸ Rhymes of heavy swells ▸ Invented words related to heavy swells