This is the 11368th most frequent Turkish word.
ellerinde
"In their hands" or "in your hands" (depending on context).
Here, 'ellerinde' indicates possession or the physical state of the books being held in their hands.
Ellerinde kitaplarla bekliyorlardı.
They were waiting with books in their hands.
In this context, 'ellerinde' symbolizes something held or associated with the hands in an abstract sense.
Bahçede oynarken çiçeklerle ellerinde sis gördüm.
While playing in the garden, I saw fog in their hands with flowers.
Here, 'ellerinde' metaphorically refers to having control or possession of an opportunity.