The word 'trawl' is specifically associated with the act of fishing using a large net. Local laws regulate how ships can trawl to protect marine life.
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Wide Area
'Trawl' implies covering a broad area in a dragging motion, often in hope of a big catch. Sure enough, when they trawled the bay, they caught a variety of fish.
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Physical Effort
The action of 'trawling' involves significant physical effort and is a labor-intensive process. They were exhausted after trawling the sea all night.