promissory estoppel
C2CEFR level
78/100Rarity: rare
TechnicalRegister
A doctrine preventing a party from going back on a promise relied upon by the other, even without consideration.
Promissory estoppel barred the landlord from claiming the arrears he had promised to waive.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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