tailer

Short definition from Wiktionary

Noun

1. 1
   One who follows or tails surreptitiously, as an investigator.
2. 2
   A worker on a yacht, responsible for furling and setting the sails.
3. 3
   A large noose with a long handle intended to secure a fish's tail.
4. 4
   A fish bottom-feeding in shallow water with its tail out of the water.