More on Rest on One's Oars from Infoplease:

• Rest on One's Oars - Rest on One's Oars (See Oars.) Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894 ...
• oar: meaning and definitions - oar: Definition and Pronunciation
• Oars - Oars To rest on one's oars. To take an interval of rest after hard work. A boating phrase. To ...
• Dictionary of Phrase and Fable: R - Definitions, origins, and illustrative excerpts for words, phases, and literary allusions starting with "R"