- to terrify or frighten.
Origin of gast
before 1000; Middle English gasten, Old English gǣstan
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
"animal which does not produce in season," 1729, an East Anglian dialect word, perhaps from Middle Dutch gast "barren soil."
Online Etymology Dictionary, © 2010 Douglas Harper