This is the 12857th most frequent Russian word.
кушать
"Кушать" means "to eat."
Here, 'кушать' is used in its basic form meaning 'to eat'. It describes the act of consuming food, specifically an apple in this case.
Я кушаю яблоко.
I am eating an apple.
In this context, 'кушать' is used in the imperative form to suggest or advise eating as an action to take before performing another activity.
Не забудьте покушать перед уходом.
Don't forget to eat before leaving.
Here, 'кушать' is used to describe a habitual action related to eating, emphasizing the communal activity of having meals together.