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In a sentence
Potajomky si prečítala list položený na stole.
She secretly read the letter lying on the table.
Deti potajomky jedli čokoládu pred večerou.
The children secretly ate chocolate before dinner.
Potajomky si odfotil poznámky spolužiaka.
He furtively photographed his classmate's notes.
Otec potajomky pripravoval prekvapenie k narodeninám.
Father was secretly preparing a birthday surprise.
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Hand-reviewed example sentences.
Full attribution on References.