This is the 98th most frequent Hungarian word.
vissza
"Vissza" means "back" or "return" in English.
The word 'vissza' is used as a prefix to the verb 'ad' (to give), forming 'visszaad' (to give back), indicating the act of returning something.
Visszaadta a könyvet a könyvtárnak.
He returned the book to the library.
Here, 'vissza' is prefixed to 'csukódott' (closed) to form 'visszacsukódott', referring to the door closing to its previous position by itself.
A szobaajtó visszacsukódott magától.
The room door closed back by itself.
In this sentence, 'vissza' is prefixed to 'mentem' (went), becoming 'visszamentem', to indicate returning to a previous place (the shop).