I am a bit confused now. "I am taking fire." - Does it mean that I am shooting someone or that someone is shooting me? Thank you for your help.
In a militarian context, "taking fire" would mean being shot at, attacked:
Send air support, we're taking heavy fire here!
Other use cases:
It can also be used in a more idiomatic manner in certain settings, to convey the idea that one is being critized.
"I'm taking all the fire for a mistake that you've made."
"John, Kerry's spokesperson, elected to take all the fire when he showed up to the press conference alone."
The "dry" definition of "take fire" is:
start to burn or burst into flames