What is the meaning of Flak?

Ground-based anti-aircraft guns firing explosive shells.

Anti-aircraft shell fire.

Adverse criticism.

A public-relations spokesperson.

to throw, hurl, toss, fling off

to smack

to cast off, eject

to renounce, reject

↑ Orel, Vladimir (1998), “flak”, in Albanian Etymological Dictionary, Leiden; Boston; Köln: Brill, →ISBN, page 2

wreck

filet, (UK) fillet (of fish)

a flake

floe

tail

a flake

floe

tail

shallow (not deep)

sausage casing made from animal intestine

part of animal entrails

flat tyre (deflated tyre)

weak, exhausted person

traditional tripe soup made from the stomach of a cow, occasionally also deer

entrails, guts, innards, intestines, viscera (internal organs of the abdominal and thoracic cavities)

a larger, relatively flat piece, especially an ice floe; a floe, etc.

a bed; a flatbed; a box ((open) bed of a vehicle, like a (pickup, dump, etc.) truck, trailer, moped with a cargo bed, etc.)

a 24-pack of (usually beer) cans; a case, a carton

Source: wiktionary.org