English▸ verb [with object] smooth the lines of (a vehicle, boat, or aircraft) to reduce drag; streamline:
we've sanded and faired the hull and have primed it for winter
(as adjective faired) faired bikes are much more comfortable for doing longer distances.
– ORIGIN Old English in the senses ‘beautify’ and ‘appear or become clean’. The current sense dates from the mid 19th century.