babysit

verb (used without object), ba·by-sat, ba·by-sit·ting.

1. to take charge of a child while the parents are temporarily away.

verb (used with object), ba·by-sat, ba·by-sit·ting.

2. to baby-sit for (a child): We’ve placed an ad for someone to baby-sit the youngsters in the evening.
3. to take watchful responsibility for; tend: It will be necessary for someone to baby-sit the machine until it is running properly.

verb -sits, -sitting or -sat

1. (intr) to act or work as a baby-sitter