Is this an example of an Idiom?

[MillyLynn]

"I`d better get back to work before the old battle-ax fires me."
Is this an idiom? If it is, then what does this idiom mean?
Please help me as soon as possible. Thank you(:

[MillyLynn]

help???

[billmcd]

The term "battle ax" originally referred to a weapon of war used in ancient times but currently refers to a domineering woman that could be a boss or even a wife.

[Gillnetter]

"I`d better get back to work before the old battle-ax fires me."
Is this an idiom? If it is, then what does this idiom mean?
Please help me as soon as possible. Thank you(:

No. This means that the person had better return to work before the woman in charge terminates the employment of the late person.

[Tdol]

Given that idioms are generally held to be phrases that have a meaning that is different from the dictionary meaning of the individual words, battleax[e] isn't an idiom, but you could call it an idiomatic usage if you like, though its meaning is given in dictionaries, but it has changed quite a lot from the original meaning.

[billmcd]

"No" ? To what are you referring? I provided a definition of "battle ax".