This is the 3562nd most frequent Arabic word.
يده
"Yaduhu" means "his hand."
In this sentence, 'يده' refers explicitly to the literal hand of the subject used to hold an object.
كان يمسك الكتاب بيده.
He was holding the book in his hand.
Here, 'يده' illustrates the instrument or means through which assistance or action is performed, referring to the hand used to provide help.
ساعدته بيده في العمل.
She helped him with her hand in the work.
'يده' in this context signifies the action effect performed by the individual’s hand, emphasizing the physical contact leading to a visible result.