Lexical Definition

‎נָשֶׁה‎ nâsheh (naw-sheh') hamstring ^H:N-M
from ‎נָשָׁה‎, in the sense of failure

which shrank.

• rheumatic or crippled (from the incident to Jacob)

1) vein, nerve, tendon (in the thigh)

Brown-Driver-Briggs

‎נָשֶׁה‎ noun [masculine] a vein (or nerve) in the thigh (etymology dubious; on formative compare Lag^{BN 50}; Arabic apparently the portion of the principal vein of the leg which is in the thigh, vulgar sciatic vein, or (modern) sciatic nerve and even sciatica, Lane³⁰³³); — only ‎גִּיד הַנָּשֶׁה‎ Gen Gen 32:33*a the sinew of the thigh-vein (or thigh-nerve, ‎אֲשֶׁר עַלכַּֿף הַיָּרֵךְ‎), compare v33b. — On sacredness of thigh, compare RS^{Sem i. 360; 2nd ed. 380} We^Heid (2), 168. ‎נָשִׁים‎ see ‎אִשָּׁה‎ above

Brown-Driver-Briggs References