辞書 ポーランド語 - 英語
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przewaga nad konkurencją 英語で:
1. 
competitive edge
to gain a competitive edge
The team seems to have lost its competitive edge recently (=its ability to compete well).
2. 
competitive advantage
If a start-up's competitive advantage doesn't appear to be sustainable e. g. because of the threat of new entrants, investors won't be interested.
Sometimes companies behave unethically in order to gain competitive advantage.
an edge on our competitors 
competition advantage 
competitive advantage over 
an edge over the competition 