Real Dictionary

perch
verb: If you perch on something, you sit down lightly on the very edge or tip of it.

perch in American English 1
a horizontal rod, pole, etc. provided as a roost for birds
to alight or rest on or as on a perch
to place or set on or as on a perch
intransitive verb: to alight or rest upon a perch
noun: a pole or rod, usually horizontal, serving as a roost for birds
transitive verb: to set or place on or as if on a perch

perch in American English 2
any of a family (Percidae) of small, spiny-finned, freshwater, percoid food fishes of Europe and America; esp., a yellowish species (Perca flavescens) of North America
noun: any spiny-finned, freshwater food fish of the genus Perca, as P. flavescens (yellow perch), of the U.S., or P. fluviatilis, of Europe

perch in British English 1
noun: a pole, branch, or other resting place above ground on which a bird roosts or alights
verb: to alight, rest, or cause to rest on or as if on a perch

perch in British English 2
noun: any freshwater spiny-finned teleost fish of the family Percidae, esp those of the genus Perca, such as P. fluviatilis of Europe and P. flavescens (yellow perch) of North America: valued as food and game fishes