to ask someone to prove a statement they have made
to decide to use something that someone can offer you
to officially ask a person or organization to do something
to produce a particular quality in yourself, especially by making a great effort
to visit someone, usually for a short time
She called on all her reserves of courage to face the ordeal ahead of her.
The human rights group has called on the US to end the death penalty.
We could call on my parents if we have time.
We may need to call on professional help.
calls on
calling on
called on
There is no origin for this phrasal verb
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