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know for a certainty; know for sure (ART Vancouver); know of a certainty (Olga Fomicheva); know for certain (With the captain’s report everything came together — secret bases, government cover-ups, global warfare, ancient aliens, pyramid power — to create the story of the Black Pyramid. The story that Campbell, if he followed any of the internet lore, surely planned his summer vacation around. No one knows for certain if Campbell believed any of this.  anomalien.com ART Vancouver) | |||
| know 100 percent; know for a fact | |||
| know without doubt (Val_Ships) | |||
| bet London to a brick; bet one's boots on it | |||
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| know something for a fact | |||
| знать наверняка: 14 phrases in 5 subjects |
| Australian | 2 |
| Cliche / convention | 1 |
| General | 9 |
| Informal | 1 |
| Makarov | 1 |