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1. An intensifier used when one puts forth great effort to do something. I'm planning to fight like hell against this illness, so I'm researching both Western and Eastern methods of treatment.
2. A phrase used to convey one's impassioned denial, refusal, or rejection of something. A: "I don't care what you say, Mom—I'm going to that party!" B: "Like hell you are!"
1. Recklessly, extremely, as in We ran like hell to catch the train. [Mid-1800s]
2. Not at all, on the contrary, as in You think I'll call her stupid? Like hell I will! or Like hell I can't say that to Bob. [Late 1800s]
1 (informal) very hard, very much, very fast, etc. in an effort to do something: I had to run like hell to catch the bus.
2 (spoken) used to give emphasis when saying no to a suggestion, idea, etc: ‘He thinks you’re going to lend him your car this weekend.’ ‘Like hell I am.’(Some people find this use offensive.)
exclam. That is not true!; I do not believe you! (Use caution with hell.) You’re going to a Dead concert! Like hell!
See also: like
1. Used as an intensive: He ran like hell to catch the bus.
2. Used to express strong contradiction or refusal: He says he's going along with us—Like hell he is!