(Of a bird) tidy and clean its feathers with its beak
a robin sat on a low branch, preening its feathers
A pinhead; frequently as the type of something small, insignificant, or of little worth.
A gland at the base of a bird’s tail, which produces the oil used in preening
(Of a person) devote effort to making oneself look attractive and then admire one’s appearance
he's busy preening himself on acquiring such a pretty girlfriend