trawl

Short definition from Wiktionary

Noun

1. 1
   A net or dragnet used for trawling.
2. 2
   A long fishing line having many short lines bearing hooks attached to it; a setline.

Verb

1. 1
   To take (fish or other marine animals) with a trawl.
2. 2
   To fish from a slow-moving boat.
3. 3
   To make an exhaustive search for something within a defined area.