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Edit  dc
can't avoid doing x
i can't not go [always double-neg]
Edit  dc
See also
I must go.
Edit  #1061 Amatuka
the rules are decided by everybody, so you must obey them
Edit  #1062 Amatuka
My grades are bad so I have no choice but to repeat the year.
Edit  #1063 Amatuka
I have to oppose this idea.
Edit  #4287 Miki
We have no choice but to compromise.
Edit  #4288 Miki
At this rate, we'll have to change the schedule.
Edit  #4289 Miki
If you say that you cannot help doing something, you mean you cannot prevent or avoid it.
Edit  #4290 Miki
I cannot help thinking so.
Edit  #4291 Miki
We are subject to change our plans if the president disagrees.
Edit  #4292 Miki
I cannot help crying for sympathy.
Edit  #4293 Miki
I can't but accept his invitation.
Edit  #4294 Miki
I could not but think that he was dead.
Edit  #4295 Miki
I feel for my father, who has to work on Sundays. [M]
Edit  #4296 Miki
I don't want to go, but because it's the manager's order, I have no choice but to go.
Edit  #6131 rubyhatchet
The amount of money was huge and I couldn't pay it, so I had no choice but to ask my father for assistance.
Edit  #6132 rubyhatchet
Forced to defend an important person.
Edit  #8560 belajar
Discussion and comments
〜ざるを得ない: 〜したくないが...しなければならない
This is an auxiliiary indicating that there is no other choice but to do something. Possible translations include: cannot help 〜ing; cannot help but; have no choice but to have to.

Vneg + ざるを得ない
Examples: 食べざるを得ない // 行かざるを得ない
Exception: する -> せざるを得ない
*Be very careful as to when you replace one of these phrases with another.

Vneg + ざるを得ない : used in a situation where one has no choice but to do something.

V + しかない : used in a situation where one has no choice but to do something.

Vneg + なければならない : used in a situation where one has to do something because s/he has an obligation to do it OR where one has no choice but to do something.

Vneg + わけに(は)いかない : used in a situation where one has to do something because s/he has an obligation to do it OR where one has no choice but to do something. It also expresses the unwillingness of the speaker to do V.
Lit (sort of) : Unable to obtain not doing ___
Note the verb form 〜ざる is a left over from a classic form that is now pretty much out of general use.
(Don't ask me more, please ;-)
Hmm, on second thoughts I'm only about 60% sure it's the negative of うる and not the negative of える.

That word's a pain.
isnt える and うる the same verb in this case?
Please see the comment by bamboo4 in [uru]. ざるを得ない is one word and always read as ざるをえない. There is no ざるを得る.
Formed from v-nai base + ざるをえない.
e.g. 行く→行かない→行かざるをえない

Vn = V-nai base
ざる is an archaic particle indicating negation. It's root form is ず and it inflects as ず/ざら、ず/ざり、ざる/ぬ、ざれ/ね but its imperative form is ざれ. In tbis manner, it has very unique inflections.
行かざる means not going, which is denied by えない so that it becomes "not going is not capable," the double negative thus resulting in "I must go."
#4293 is not acceptable. 同情の涙を禁じ得ない would be the correct diction. ざるを得ない is not appropriate so that this example does not belong to this head.
#4293 grammatically is not wrong, but the meaning is very strange. Because 〜ざるを得ない means you have to do 〜even you don't want to, and 禁じる means 抑える or suppress,
So, 同情の涙を禁じざるを得ない means:
You have to suppress tears of sympathy, even if you didn't want to (suppress).

Whereas, 同情の涙を禁じ得ない means(which is more natural in this case):
You couldn't suppress/stop tears of sympathy (of dropping down).同情の涙を抑えることができない
Thank you guys. I felt something wrong but I didn't notice that point. I found a better entry "kinjienai" for the example but I cannot do now.