an inward turn or curve around an axis or fixed point.

Origin of inturn

First recorded in 1590–1600; in-1 + turn
Related formsin·turned, adjective
Can be confusedintern inturn in turn Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Word Origin and History for inturn

1590s, "turning in of the toes" (especially in dancing), from in + turn.

Online Etymology Dictionary, © 2010 Douglas Harper