Call (something) square phrase
To declare a debt or obligation paid or ended.
Thank you for paying the debt. Now I can call it square.
Our partner has just squared up and we can call it square now.
The verb "call" should be conjugated according to its tense.
It was often said by a photographer when he would like small children to look at the camera and smile before he took a photo.
When the photographer said “watch the birdie”, all of us looked at the camera and smiled.