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obstacle

In a sentence
Narazil na nečakané prekážky.
He encountered unexpected obstacles.
Toto je prekážka.
This is an obstacle.
Practice frame
Examples from Tatoeba (CC BY 2.0 FR).
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Includes Tatoeba example sentences when present.
Full attribution on References.