Flak (noun)

1. Anti-aircraft fire.
2. Criticism or opposition, especially strong criticism.
3. Shrapnel or fragments from a bomb or shell.

Origin:

Short for german fliegerabwehrkanone ("aircraft defense gu.n")

Examples:

1. The bomber had to fly through heavy flak to reach its target.
2. He got a lot of flak for his controversial statement.
3. The flak from the exploding bomb damaged several buildings.
4. The company received a lot of flak for its poor customer service.
5. The politician's proposal received a lot of flak from the opposition.