call out phrasal verb ( see also ↑ call )
1 . to say something loudly
call something ↔ out
‘Hi there!’ I called out.
call out to
The firemen called out to him.
2 . call somebody ↔ out to ask or order a person or an organization to help, especially in a difficult or dangerous situation:
The army was called out to help fight fires.
3 . call somebody/something ↔ out British English to order workers to go on ↑ strike :
The transport workers were called out.