1. Friends who are very close, loyal, and maintain a strong bond; people who share a deep friendship and trust
John and Mike are tight friends; they've known each other since childhood.
João e Miguel são amigos muito chegados; se conhecem desde a infância.
2. Friends who spend a lot of time together and share similar interests or activities
The band members became tight friends after touring together for years.
Os membros da banda se tornaram amigos muito chegados depois de fazer turnês juntos por anos.