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troll

2 verb
     
troll2 [intransitive and transitive] American English
1 to try to remove something from a river, ocean etc by pulling a rope, line etc through the water:
Ships towing huge magnets trolled the ocean floor.
troll for
I would troll for fish from the rowboat.
2 to try to obtain something by searching, asking people etc [= trawl British English]
troll (something) for something
Stewart spent hours trolling the Web for information.

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