upthrust - definition and synonyms

noun 

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/ˈʌpˌθrʌst/
singularupthrust
pluralupthrusts
  1. 1
    [uncountable] physics the force that a liquid or gas directs upwards on an object that is floating on it
  2. 2
    [countable/uncountable] a large piece of rock that has moved upwards in a crack in the Earth’s surface