I. swish 1 /swɪʃ/ BrE AmE verb [intransitive and transitive]
[ Date: 1700-1800 ; Origin: From the sound ]
to move or make something move quickly through the air with a quiet sound:
Her skirt swished as she walked.
—swish noun [singular]
II. swish 2 BrE AmE adjective British English
fashionable and expensive:
a swish new apartment block