earthshaking

/ˈɜrθˌʃeɪkɪŋ/
adjective
  1. Having a very great or profound effect; extremely important or significant.
    • Her earthshaking speech inspired millions to take action on climate change.
    • The court's earthshaking decision changed the law for everyone.
    • The discovery of penicillin was an earthshaking breakthrough in medicine.
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