What does the root word strict mean?

The root word "strict" comes from the Latin word "stringere", which means "to bind" or "to tighten".

This root sense of binding or tightening is reflected in the meaning of "strict" - to be firm, inflexible, or severe in the application of rules or principles.

For example, a "strict teacher" enforces rules with little leeway, while a "strict diet" restricts certain types of food.