as a follower, admirer, or companion: a professor who always had a graduate student in tow.
8.
under tow, in the condition of being towed; in tow.
Origin: before 1000; Middle English towen (v.), Old English togian to pull by force, drag; cognate with Middle High German zogen to draw, tug, drag. See tug
"coarse, broken fibers of flax, hemp, etc.," late 14c., probably from O.E. tow- "spinning" (in towlic "fit for spinning"), perhaps cognate with Gothic taujan "to do, make," M.Du. touwen "to knit, weave." Tow-head, in ref. to tousled blond hair, is recorded from 1830.