underpin
B2CEFR level
40/100Rarity: uncommon
FormalRegister
To provide the theoretical or evidential foundation on which something rests.
A constructivist view of learning underpins the whole of the study's design.
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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