"To stop the activity" means to halt or cease whatever action or task is currently being done. It refers to putting an end to the specific action or process that is in progress. Full definition
Heavy metals are some of the strongest irreversible enzyme inhibitors — at the cell membrane or liver they can stop the activities of many protective enzyme systems. (puretyclinic.com)
Then contact the credit - reporting agencies, tell them what happened and ask for a credit freeze, which will stop any activity on your accounts without your explicit consent. (tomsguide.com)
Follow your child's lead and stop the activity when your child is no longer interested. (readingbrightstart.org)