A (usually rigid), flat, rectangular measuring or drawing device with graduations in units of measurement; a straightedge with markings.
A person who rules or governs; someone or something that exercises dominion or controlling power over others.
To beat with a ruler (as a traditional school punishment).
A flat, rectangular tool used to draw, cut or check the straightness of straight lines.
Living one's life opposing or eschewing the use of substances such as alcohol, tobacco, and drugs.