This is the 11625th most frequent Polish word.
klapkach
"Klapkach" is the locative or dative plural form of "klapki," meaning "flip-flops" or "slippers."
Here 'klapkach' is the locative plural form of 'klapki' (flip-flops), used to specify the location of the subject's footwear while at the beach.
Byłam na plaży w klapkach.
I was at the beach in flip-flops.
Incorrect. Should be: 'Nie mogę znaleźć klapek pod łóżkiem.', genitive plural for 'klapki' (flip-flops). 'Klapkach' is improperly used in this context.
Nie mogę znaleźć klapkach pod łóżkiem.
I cannot find the flip-flops under the bed.
In this sentence, 'klapkach' is used correctly as the locative plural form of 'klapki' (flip-flops), following the preposition 'w' which governs the locative case.