Definition of chase off:
(v) :
(transitive) To discard or reject something.
(v) :
(ambitransitive, nautical) To let go (a cable or rope securing a vessel to a buoy, wharf, etc.) so that the vessel may make way.
(v) :
(intransitive, knitting) To finish the last row of knitted stitches and remove them securely from the needle.
(v) :
(printing, historical) To estimate the amount of space required by the type used for the given copy.