It means: deep feelings and intimate relationships between friends.

Citation explanation:

1.? Friendship between friends.

Zou Taofen's Friendship and Authority: "Friendship is the most precious thing between heaven and earth, and deep friendship is the greatest comfort in life."

2.? friends.

The eighth time in "Twenty Years of Fanhua Dream": "The next day, I will invite Qi Youyi to visit me and go to Mei for dinner."

3.? Friendly and harmonious.

Yuan Ying's "Song of the Distant Five Letters": "Black Africa, black Africa, the whole world has extended a hand of friendship."

： 1? It is difficult to tell our friendship in a thousand words.

2. We have established a close friendship in adversity.

3. The friendship between our people and people of other countries has been continuously enhanced.

It's a shame that our friendship broke up because of this little contradiction.

5. Two comrades-in-arms forged a brotherly friendship in the battle of life and death.