Flack and Set-to

Flack noun - Artillery designed to shoot upward at airplanes.

Set-to and flack are semantically related. In some cases you can use "Set-to" instead a noun "Flack".

Set-to noun - An often noisy or angry expression of differing opinions.

Flack and set-to are semantically related. Sometimes you can use "Flack" instead a noun phrase "Set-to".