the prevailing atmospheric conditions, esp with regard to heat or cold, wetness or dryness, etc calm or storm, and clearness or cloudiness
(used before a noun) windward
make heavy weather/make heavy weather of
said of a ship: to pitch and roll because of rough seas
informal (+ of) to have unnecessary difficulty in doing or completing (something)
under the weather
informal mildly ill or depressed; not fully well
[Old English weder]