Other forms: baby-sitting
To baby-sit is to look after a child while the parents are out. Baby-sit for a neighbour.
It was a teenager's first paid work for a whole generation and is much rarer now. To baby-sit a project is the same word used of watching something that needs no real work.
1verbbaby-sitTo look after a child while the parents are out.
“She used to baby-sit for four families on the same road.”
baby-sit is an action.
babysit a back-formation from babysitter.
Etymology from Wiktionary, CC BY-SA