This is the 14736th most frequent Polish word.
płaczu
"Płaczu" means "of crying" or "of weeping" (genitive singular form of "płacz").
The word 'płaczu' is used in the locative case to refer to the state or period involving crying.
Po długim płaczu odczuł ulgę.
After a long crying, he felt relief.
The word 'płaczu' represents the act or time of crying, functioning as the locative object.
Nie mogłem go uspokoić podczas jego płaczu.
I couldn't calm him during his crying.
Here, 'płaczu' is used in the genitive case to describe something associated with crying.