Fish

The chess slang "fish," for a weak player, has no single confirmed origin, but the most widely cited theory ties it to an older English sense of "fish" as a person considered easy to "catch" — a sense documented from as early as 1722 in a mildly dismissive register, later shading into 1750s usage describing someone easily deceived or taken advantage of. Applied to chess, the metaphor suggests a weak player who can be lured in and caught with a simple trap or piece of bait, much as a fish is drawn to an angler's hook. The term's relative, rather than absolute, quality distinguishes it from a fixed-threshold insult like woodpusher: any player, regardless of rating, can be called a "fish" by someone sufficiently stronger, making it one of the more flexible pieces of chess slang for describing a mismatch in skill rather than a specific skill level itself.