(idiomatic) To take action on the basis that another person is bluffing.

plural of reverse 911 call

To speak frankly about a given topic, not withholding one's opinions.

Indicates that the speaker is going to call the police, presumably to counter actions from the interlocutor.

(US) A call initiated by emergency services to telephone numbers, to, for example, announce a mandatory evacuation.

plural of tactical call sign

A prefix that must be prepended to a telephone number in order to call a number outside one's own country.

more than what is needed.

plural of first port of call

Third-person singular simple present indicative form of call a spade a spade