If you babysit for someone or babysit their children, you look after their children while they are out. I promised to babysit for Mrs Plunkett You can take it in turns to babysit She had been babysitting him and his four-year-old sister. + babysitter babysitters baby·sitter It can be difficult to find a good babysitter. + babysitting baby·sitting Would you like me to do any babysitting?. to take care of children while their parents are away for a short time