Definition of tillow:
(n) :
(UK dialectal) Branch; twig; shoot.
(v) :
(intransitive, UK dialectal) To spread; branch out; send forth shoots.
(n) :
Alternative form of tiller (“type of plant shoot”). [A person who tills; a farmer.]
(v) :
Alternative form of tiller. [(intransitive) To produce new shoots from the root or from around the bottom of the original stalk; stool.]