This is the 671st most frequent Ukrainian word.
нашими
"Нашими" means "our" (instrumental plural form) in English.
This sentence uses the word 'нашими' as an instrumental plural form indicating possession and shared ownership of the mentioned object, 'успіхами' (achievements).
Ми пишаємося нашими успіхами.
We are proud of our achievements.
In this sentence, 'нашими' is used instrumentally in plural form to specify 'друзями' (friends) as those related to or associated with us.
Всі ми зустрілися в парку з нашими друзями.
All of us met in the park with our friends.
Here, 'нашими' describes 'враженнями' (impressions) in the instrumental plural form to emphasize shared personal experiences.