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eye
In a sentence
Poznali cenu priateľstva a chránili ho ako oko v hlave.
They knew what friendship is worth and cherished it like the apples of their eyes.
Padla mi do oka muška a nemôžem ju vybrať.
I got a bug in my eye and I can't get it out.
Padlo mi niečo do oka.
I've got something in my eye.
Mám niečo v oku.
I have something in my eye.
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.