This is the 120th most frequent Ukrainian word.
свій
"Own" or "one's own."
Here, 'свій' (their own) agrees with 'дім' (home) in quantity and gender, indicating possession.
Кожна людина має захищати свій дім.
Every person must protect their own home.
In this case, 'свої' (her own) is the plural form, associated with 'речі' (things), showing individual ownership.
Вона бере свої речі перед дорогою.
She takes her belongings before the journey.
Here, 'своїм' defines the instrumental case, correlating with 'містом' (city), and indicates collective pride.