Meaning: This idiom has multiple meanings depending on the context:

1. To visit someone, often for a specific reason.
2. To formally ask someone to do something or to answer a question.
3. To request help or demand action from someone.

Usage in Example Sentences:

1. “I will call on my friend later to see how she’s doing.” (Visit)
2. “The teacher called on me to answer the question.” (Request/ask)
3. “We need to call on the police to help with this situation.” (Request help)

Origin: The phrase “call on” stems from the older usage of “call,” meaning to summon or request someone’s presence. Over time, “call on” evolved into a formal or polite way of asking for someone’s attention or assistance. It’s been in use for centuries and is now common in both formal and informal contexts.