washin

[wosh-in, wawsh-] /ˈwɒʃˌɪn, ˈwɔʃ-/
noun, Aeronautics
1.
a warp in an airfoil that gives an increase in the angle of attack toward the tip.
Also, wash-in.
Compare washout (def 3).
Origin
1930-35; noun use of verb phrase wash in
British Dictionary definitions for washin

washin

/ˈwɒʃɪn/
noun
1.
(aeronautics) an increase in the angle of attack of an aircraft wing towards the wing tip
Word Origin
C20: from wash (flow) + in