Definition of lash:
the thong or braided cord of a whip, with which the blow is given; a leash in which an animal is caught or held; hence, a snare
"I observed that your whip wanted a lash to it. — Addison."
to strike with a lash; to whip or scourge with a lash, or with something like one; to strike forcibly and quickly, as with a lash; to beat, or beat upon, with a motion like that of a lash
"we lash the pupil, and defraud the ward. — Dryden"
"1658: Fruits being unwholesome and lash before the fourth or fifth Yeare. -- Sir Thomas Browne, The Garden of Cyrus (Folio Society 2007, p. 211)"