We found one dictionary that defines the word sweep oars:

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1. sweep oars: Vocabulary.com

(Note: See sweep_oar as well.)

Definitions from WordNet (sweep oar) ▸ noun:  a long oar used in an open boat ▸ Also see sweep_oar ▸ Words similar to sweep oars ▸ Usage examples for sweep oars ▸ Idioms related to sweep oars ▸ Wikipedia articles (New!) ▸ Words that often appear near sweep oars ▸ Rhymes of sweep oars ▸ Invented words related to sweep oars