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nothing, lack of anything (i.e. lack of anything of value: You [don't] know jack shit about politics. (Inclusion of "don't" is optional, as its omission is construed in context as “All that you know about [whatever matter] amounts to jack shit.)  wiktionary.org) | |||
| jack: 11 phrases in 4 subjects |
| Proverb | 5 |
| Saying | 4 |
| Sports | 1 |
| Statistics | 1 |