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 under-doing

Historical Examples of under-doing

  • "Over-doing in work is not likely to lead to under-doing a breakdown," Miss Bradbury replied to Mrs. Scollard's remark.

    Six Girls and Bob

    Marion Ames Taggart