tend (v.1)

"to incline, to move in a certain direction," early 14c., from Old French tendre "stretch out, hold forth, hand over, offer" (11c.), from Latin tendere "to stretch, extend, make tense; aim, direct; direct oneself, hold a course," from PIE root *ten- "to stretch."

"attend to," c. 1200, a shortening of Middle English atenden (see attend).