keep (one's) feet on the ground

Translations
оставаться реалистом
Despite his success, he always keeps his feet on the ground.
Несмотря на свой успех, он всегда остаётся реалистом.
Definitions
To remain practical and realistic, especially in difficult situations; to stay grounded and not become overly optimistic or unrealistic.
Words
foot

noun
нога
ground

noun
земля
keep

verb
держать