(military) A call sign which does not represent a specific facility, command, authority, activity, or unit, but which may represent any one or any group of these.

(military) A call sign that represents all stations within a net.

(military) A call sign that identifies a tactical command or tactical communication facility.

(military) A call sign assigned in accordance with the provisions of the International Telecommunications Union to identify a radio station. The nationality of the radio station is identified by the first or the first two characters. (When used in visual signaling, international call signs are referred to as “signal letters.”)

(idiomatic) To ease up on after inflicting great punishment.

(computing) A technology that allows a computer program to cause a subroutine or procedure to execute in another address space, commonly on another computer on a shared network, without the programmer explicitly coding the details for this remote interaction.

(nautical) The first port that a vessel calls in at after the start of a voyage / (idiomatic) The first place to go to start a process.

plural of net call sign

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

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