Sentence:  ...} but if they shake the line and move, after they have remained still three or four minutes, you may conclude the fish has <WSD>pouched</WSD> the bait and feels the hooks, then wind up your slack and strike, but not violently, and always mind to keep the point of your rod a little raised while you are playing and killing your fish ... 
Meaning of the word marked with <WSD> tags:  To swallow.