Underdo definition
To do to an insufficient degree, especially to cook for too short a time.
verb
To do less than is usual, needed, or desired.
verb
(intransitive) To act below one's abilities; do less than one can.
verb
(intransitive) To do less than is requisite.
verb
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Origin of underdo
- From Middle English underdon, from Old English underdōn (“to put under"), from Proto-Germanic *under + *dōnÄ… (“to put"), equivalent to under- +"Ž do. Cognate with German unterthun (“to put under, subject").
From Wiktionary