(a close friend who accompanies his buddies in their activities)
person defined by personal relation (person who is a friend such as school friend, fishing buddy, classmate, etc.)
a playmate
a close friend with whom one is having a chat and a cup of tea
よい友だち
to have a chat with some one
友達がいに
for friendship's sake
a dark-colored beverage produced by steeping the dried leaves of a certain plant in boiling water, served hot