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| English | Russian |
| if one know what's good for one | лучше бы тебе делать то, что от тебя ожидают (Interex) |
| know what's up | шарить (I thought, "I should go out." But what's "should?" Do I need to? No. Do I want to? Also no. Even my cat, look at him being all lazy – he knows what's up.  hinative.com, tiktok.com Shabe) |
| know what's what | знать, что к чему |