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In a sentence
Zlepšilo sa to.
It got better!
Počasie sa zlepšilo.
The weather has improved.
Chce zlepšiť svoju angličtinu pred skúškou.
He wants to improve his English before the exam.
Nové svetlá zlepšili bezpečnosť na ceste.
The new lights improved safety on the road.
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.