This is the 12652nd most frequent Russian word.
концом
"Концом" means "by the end" or "with the end" in English, depending on context.
The word 'концом' is used here as 'success', metaphorically as the 'end' to mean completion or culmination.
Наконец, я достиг своей цели с большим концом.
Finally, I achieved my goal with great success.
Here, 'концом' refers to 'end' in the sense of finality or termination.
Мы умрем этим концом, если не найдем спасения.
We will perish by this end if we do not find salvation.
In this sentence, 'концом' indicates the literal physical end of a road or path.