Definitions
There are 2 meanings of the phrase
Call On.
Call On - as a verb
Have recourse to or make an appeal or request for help or information to
Example: "She called on her representative to help her"
Synonyms (Exact Relations)
turnTo visit someone, usually for a short time
Example Sentences
"I will call on you when I need your help."
"The teacher will call on each student to answer a question."
"We should call on the government to address this issue."
"I call on the board of directors to make a decision."
"It is customary to call on the eldest person to speak first."