Twitcher definitions

Webster's 1828 Dictionary

TWITCH'ER, n. One that twitches.
TWITCH'-GRASS, n. Couch grass; a species of grass which it is difficult to exterminate. But qu. is not this word a corruption of quitch-grass, or quick-grass?

Merriam Webster's

noun see twitch I

Oxford Reference Dictionary

n. 1 colloq. a bird-watcher who tries to get sightings of rare birds. 2 a person or thing that twitches.

Webster's 1913 Dictionary

Twitcher Twitch"er, n. One who, or that which, twitches.

Collin's Cobuild Dictionary

(twitchers) A twitcher is an enthusiastic bird-watcher. (BRIT INFORMAL) N-COUNT