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| Subject | Russian | English |
| Makarov. | он хорошо знает своё дело | he knows his P's and Q's |
| gen. | он хорошо знает своё дело | he knows his P's and Q's |
| Makarov. | хорошо знать своё дело | know one's subject |
| slang | хорошо знать своё дело | know one's shit (The engineers who designed this know their shit. joyand) |
| gen. | хорошо знать своё дело | have been around the block (These guys are just top quality people and players, and then you look and see all the experienced guys who have been around the block. 4uzhoj) |
| gen. | хорошо знать своё дело | know one's onions |
| gen. | хорошо знать своё дело | understand one's business thoroughly |