Definition of shilling for English Language Learners. : a British coin used before 1971 that was equal to 1/20 of a British pound.
Esotropia is the name for crossed eyes. The condition of having eyes that don't align properly is strabismus or heterotropia. Esotropia is one type of strabismus. In exotropia, the eyes don't cross, but instead one seems to point outward. Strabismus and Tropia both mean crossed eyes.
The other conditions leading to crossed eyes are cranial nerve palsy, diseases affecting the small arteries like diabetes, high blood pressure, high cholesterol, hardening of arteries with aging....