English MCQsRule of thumb means ? Posted on April 16, 2021 by Rana Amir KhanA. Mark of thumb on a legal paper B. a rough estimate C. an easy choice D. an unknown ruleShare this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on WhatsApp (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on LinkedIn (Opens in new window)