run up vs cast off

run up and cast off both are verbs.

Word	Noun	Adjective	Verb	Adverb
run up	No	No	Yes	No
cast off	No	No	Yes	No

As verbs, cast off is a hyponym of run up; that is, cast off is a word with a more specific, narrower meaning than run up:

run up (verb)	cast off (verb)
pile up (debts or scores)	to remove
raise by using ropes and pulleys	make the last row of stitches when knitting
fasten by sewing; do needlework
make by sewing together quickly
accumulate, sometimes as a debt