Another decoding feat

Trying to figure out what Nora is saying sometimes takes some detective work.

This morning, as Fiona went up to the bathroom (4 year olds announce this, so that everyone knows), Nora shouted "Chahtch!" Jen remarked that she had heard this before, but hadn't figured out yet what it means ... but that it often accompanied Fiona going up or coming downstairs.

As Fiona came down again, Nora shouted her word again, accompanied by a hand motion ... clapping? No ... rubbing together. I asked Jen if it could be something to do with washing her hands, because I thought I'd seen that motion before. Jen said maybe ... since sometimes Fiona came down from the bathroom and washed her hands in the kitchen sink.

So I asked Nora: "Do you need to wash your hands?" and she smiled and replied "Chahtch!", accompanied by the hand-washing motion. "Wash?" said I, rubbing my hands together. "Chahtch," she agreed, nodding her head. Then she held out her hand so I could see, and there was a little spot of blue marker on one finger.