Underthigh
noun ·Rare ·Advanced level
Definitions
- 1 The back of a person's thigh.
"1883, Albert Ellery Berg (ed.), The Universal Self-Instructor, New York: Thomas Kelly, “Out-Door Exercises,” p. 350, You may walk so as to use neither calf, under-thigh, nor hip to any appreciable extent; but it is hard work to run in any way so as not to develop all three […]"
- 2 The back upper portion of a pantleg or trouser leg.
"[…] you will, I hope, never omit taking the hip-measure, which will produce a proportionate under-thigh: you will find at all times the under-sides, from the crutch to the hip, longer than the top sides."
Example
More examples"1883, Albert Ellery Berg (ed.), The Universal Self-Instructor, New York: Thomas Kelly, “Out-Door Exercises,” p. 350, You may walk so as to use neither calf, under-thigh, nor hip to any appreciable extent; but it is hard work to run in any way so as not to develop all three […]"
Etymology
From under + thigh.
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.