Have (one's) back against the wall phrase
It can also be phrased as "have (one's) back to the wall".
If you have your back against the wall, you are in a difficult situation in which you have no way of being able to get away.
His companies is saddled with huge debts. He really has his back against the wall now.
You wouldn't have had your back against the wall, if you hadn't invested a large sum of money in stocks.
This idiom is often used to express that you should accept an unpleasant situation or event because you cannot change it.
When you experience extreme and undesirable situations, it is probably essential to take extreme actions
The verb "have" should be conjugated according to its tense.
Being perfectly suitable for one's interests or abilities
Jasmine really loves children, so being a kindergarten teacher would be right up her alley.