abolish (formally end a law, system, etc.): They should abolish the tax altogether.
cancel (decide or announce that a planned event will not now take place): I feel much better now, so I am going to cancel my doctor’s appointment.
do away with (put an end to, get rid of): We decided to do away with the old customs.
ax informal (cancel, end, or dismiss suddenly): The broadcaster axed the series after only nine episodes.
call off (cancel a planned event or agreement): The weather is bad, so let’s call off the trip.
scrap (abolish, cancel): Many want the government to scrap the road tax.