This is the 9862nd most frequent Turkish word.
ayaklarının
"Ayaklarının" means "your/their feet" in English.
Here, 'ayaklarının' refers to 'your feet', indicating possession and location relative to the subject.
Ayaklarının altında yer alan taşlar sık sık düşüyor.
The stones under your feet often fall down.
In this sentence, 'ayaklarının' again means 'your feet', highlighting possession and the actions performed by them.
Ayaklarının bu kadar hızlı hareket ettiğine inanamadım.
I couldn't believe how fast your feet were moving.
The term 'ayaklarının' is used here to denote 'your feet' in terms of the effect of an external condition on them.