'Reach' encodes the primal human gesture — from Proto-Germanic for 'to stretch out an arm toward something desired.'
To stretch out an arm or hand in order to touch or grasp something; to arrive at or attain a place, level, or goal.
From Old English 'rǣcan' meaning 'to reach, stretch out, extend, hold forth,' from Proto-West-Germanic *raikijan, from Proto-Germanic *raikijaną (to stretch out, reach). This is a causative formation from the root *raikaz (stretched out, straight), related to the idea of straightening or extending the arm. The deeper PIE connection is debated