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1. To pose as a model for an artist or as the subject of a piece of art. It's tradition that every new president of the organization has to sit for a portrait. Jenny asked me to sit for her so she can practice drawing faces.
2. To take care of children in the absence of their parents; to be employed as a babysitter for someone. (Short for "babysit for.") I can't go to the movies tonight, I'm sitting for the Robinsons again. I always loved sitting for Sarah and Jake—they felt like my own kids!
sit for someone
1. to care for someone in the role of babysitter. I sit for Timmy sometimes. I like him. He's a good little kid. Mary doesn't sit for anyone anymore. It leaves no time for a social life.
2. to serve as a babysitter in someone's employ. I sit for Mrs. Franklin every now and then. Ted used to sit for the Wilsons.
3. to serve as a model or subject for someone, such as an artist. She sat for the portrait painter every day for a week. she is looking for someone to sit for her so she can develop her skills.
To pose for someone or something: The model sat for a painting. I earned extra money by sitting for sculptors.