This is the 107th most frequent Greek word.
πίσω
"Πίσω" means "back" or "behind" in English.
Here, 'πίσω' is used as a preposition meaning 'behind' to indicate location.
Ο Γιώργος περπατάει πίσω από το σπίτι.
George is walking behind the house.
In this sentence, 'πίσω' is used as an adverb to mean 'back' in the sense of returning something.
Σε παρακαλώ, φέρε το βιβλίο μου πίσω.
Please bring my book back.
Here, 'πίσω' functions as an adverb indicating a relaxed or reclined position, typically associated with sitting.