[ uhn-der-doo ]
/ ˌʌn dərˈdu /

verb (used with or without object), un·der·did, un·der·done, un·der·do·ing.

to do less or in a lesser fashion than is usual or requisite.

Origin of underdo

First recorded in 1605–15; under- + do1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for underdo

  • A young fellow should be ambitious to shine in everything; and, of the two, rather overdo than underdo.

    A Letter Book|George Saintsbury
  • It is distinctly unhealthful either to overdo or to underdo work, play, rest, or sleep.

    How to Live|Irving Fisher and Eugene Fisk
  • The English overdo or underdo everything, and are either drunk or in despair.

    Winterslow|William Hazlitt
  • A young fellow should be ambitious to shine in everything—and, of the two, always rather overdo than underdo.