(idiomatic) A fragile or vulnerable thing, likely to be put in jeopardy.

(geography) A dry valley once occupied by a stream or river, since captured by another stream.

A renewed feeling of energy after a period of inactivity.

(nautical) Caused to ride or drive by the wind in opposition to the course of the tide; said of a vessel lying at anchor, with wind and tide opposed to each other.

plural of wind up

(figuratively, vulgar) To waste time on a pointless or fruitless task; do something that is ineffective or counterproductive.

(of horses) Having short breath or disordered respiration.

A defect of respiration in a horse, not associated with noise in breathing or with the signs of emphysema.

A katabatic wind.

A wind blowing from the south.