Understand 'oarlock' is commonly used in the context of rowing and boating activities. She checked each oarlock to ensure they weren't loose before the race.
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Specificity
'Oarlock' refers to a specific part vital for rowing, not to be confused with other boat parts. He replaced the broken oarlock so they could continue rowing without difficulty.
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Physical description
Visualize an oarlock as a small U-shaped or ring-shaped piece on the side of the boat. The new wooden oarlocks were custom-made to fit the oars snugly.