What is Trawl ?
Trawl is (noun) a long net shaped like a bag, pulled behind a trawler to catch fish A trawl is used for fishing in deep waters. (verb) 1. to trawl through something for something to search through something for something He spent hours trawling through boxes of files until he came to the letter he was looking for. 2. to fish with a trawl They went trawling for herring.
source: Easier English, Student Dictionary Upper Intermediate Level