0 to ask formally for someone to do something: --
call on/upon sb to do sth They called on the company to reverse its decision.
If you're ever called upon at work to give a talk, the very prospect of 'getting up there in front of all those people' can be intimidating.
I should now like to call upon the finance director to take you through the results.
1 to visit someone, especially to sell them something: --
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
We kunnen het stap voor stap voltooien, hoe lang de weg ook is en het kan niet worden voltooid, hoe kort de weg ook is, als je niet eens je voetafdruk markeert.