swish

(noun) a brushing or rustling sound.

(verb) move with or cause to move with a whistling or hissing sound. Synonyms: lap, swosh, swoosh. Examples: "The bubbles swoshed around in the glass." "The curtain swooshed open."

(adj) elegant and fashionable. Synonyms: classy, posh. Examples: "Classy clothes." "A classy dame." "A posh restaurant." "A swish pastry shop on the rue du bac"- julia child."