The correct spelling of the phrase "calls up on" is "calls upon". The word "upon" is pronounced /əˈpɒn/ (uh-pawn) in IPA phonetic transcription. The "u" sound in "upon" is pronounced like the "u" in "sun". The "o" is pronounced like the "o" in "gone". The "n" at the end is pronounced with a slight nasal sound. People often mistake the spelling of this phrase, but with the correct spelling, it is easier to understand the meaning of the sentence.
The phrase "calls up on" is an idiomatic expression that typically means to request or ask someone to perform a particular action or task. It implies the act of summoning or seeking assistance from someone in a specific situation or circumstance.
"Call up on" often involves reaching out to someone for aid, advice, or support. It suggests tapping into someone's expertise, experience, or resources in order to achieve a desired outcome. This can encompass a wide range of scenarios, such as seeking help in completing a project, soliciting input for a decision, or asking for assistance in a time of need.
Additionally, "calls up on" can also refer to evoking or bringing forth something from memory or recollection. It implies the act of mentally retrieving or referring to an idea, concept, or image. This aspect of the phrase often entails reminiscing or remembering past experiences or events.
In summary, "calls up on" means to ask or request someone to take action or provide assistance, guidance, or support in a specific situation or context. It can also refer to the act of invoking, recalling, or recollecting something from memory.