This is the 299th most frequent French word.
vos
"Vos" means "your" (plural or formal) in English.
The word 'vos' is used here as a possessive adjective, indicating that the ownership of 'amis' (friends) belongs to 'you' in a formal or plural sense.
Vos amis sont très gentils.
Your friends are very kind.
'Vos' serves as a possessive adjective referring to 'keys,' showing possession to 'you' in a formal or plural meaning.
Avez-vous apporté vos clés ?
Did you bring your keys?
In this case, 'vos' modifies 'idées,' designating these ideas as those belonging to or associated with 'you' in either a formal or plural address.