"Liable" is a piece of legal terminology which often gets confused or used in place of a different piece of legal terminology - and one which has a different meaning. If you were in court and got the two things confused, it wouldn't bode well for your case. We're not lawyers, but you'll see what we mean soon.
People sometimes look at "liable", get it confused with "libel", and pronounce it "lie-bull". This is the correct pronunciation of the latter word, not the former. Libel is the crime of making an unfounded defamatory statement in writing. "Liable", means "responsible" in a legal sense, so if you're liable for costs, you have to pay them, and if you're liable for an accident, it was your fault. As you can see, the meaning isn't remotely the same, and this word is pronounced "lie-a-bull".