Comprehensive resource for understanding and mastering English idioms
The idiom "call on" has two meanings. The literal meaning is to appeal or request help from someone, often by name. The figurative meaning is to invite or summon someone to a place or event. For example, "I need to call on my friends for help with this project" and "We should call on the experts for advice."
The idiom "call on" has been used in English since the 13th century. Its earliest known usage was in the Middle English phrase "callen men on," which meant "to summon people." Over time, the meaning evolved to include inviting or requesting help from someone. The term "on" was added in the 14th century and is believed to have derived from the Old Norse word "an," which means "at."