from The Century Dictionary.
- Not stooping; not bending; not yielding.
Sorry, no etymologies found.
Altogether a comedian, when he heard children shrieking with laughter, he circled the more wildly; then all upon an unexpected instant came to a dead halt, facing his audience, his nose on the ground between his two forepaws, his hindquarters high and unstooping.
Gentle Julia Booth Tarkington 1907
(a far-famed pacer of speed and endurance) under the great gateway of the Jam's fort -- high enough for a camel-rider to pass unstooping and long enough for a _rêlwêy_-tunnel -- he came upon Mahmud Ibrahim and his friends and followers (for he had many such, who thought he might succeed his father as Vizier) doing a thing that enraged my brother very greatly.
Driftwood Spars The Stories of a Man, a Boy, a Woman, and Certain Other People Who Strangely Met Upon the Sea of Life Percival Christopher Wren 1913