verb
-cels; US -celed or Brit -celled; US -celing or Brit -celling
to stop doing or planning to do (something) :to decide that something (such as a game, performance, etc.) will not happen [+ obj]
to cause (something) to end or no longer produce a certain effect :to stop (something) from being effective or valid [+ obj]
[+ obj] :to put a mark with a set of ink lines on something (such as a stamp) so that it cannot be used again
cancel out
[phrasal verb]
cancel out (something) or cancel (something) out :to reduce the effect of (something) :to be equal to (something) in force or importance but have an opposite effect