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Upwelling
- Replacement by deep water moving upwards of surface water driven offshore by wind
Uncashed
- Like a cheque which has not been deposited - not cashed
Unironic
- Not ironic, not sarcastic, to be taken seriously
Ultraprocessed
- Industrially manufactured food.
Unalaska
- Island off South West Alaska formerly a centre for the Russian fur trade.
Unrumpled
- Neat; smooth; Free of wrinkles or creases