Similar words: friend, friendly, boyfriend, girlfriend, unfriendly, friendship, bosom friend, make friends with. Meaning: n. the one friend who is closest to you.
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1. A good book is your best friend. 
2. A dog is a man's best friend.
3. A good book is a best friend who never turns his back upon us.
4. She confided all her secrets to her best friend.
5. Happy new year, my best friend.
6. Best friend, a beautiful word!
7. She is doubtless my best friend.
8. She sneaked on her best friend to the teacher.
9. The girl who spoke is my best friend.
10. Her best friend at school was called Anna.
11. My best friend tells me that I am silly to be upset about this.
12. You are the best friend becuase you always can listen to what I don't say!
13. I'm afraid my best friend has a best friend of his/her own. It feels like being in broken relationship.
14. My best friend has been like a sister to me .
15. good book is a best friend who never turns his back upon us.
16. You've been my best friend ever since we started in the infants.
17. Definition of best friend? They would let you KNOW when you had something in your teeth!
18. She's my best friend(sentencedict.com), and I really love her.
19. Bright light is the painter's best friend.
19. Sentencedict.com is a sentence dictionary, on which you can find excellent sentences for a large number of words.
20. My best friend moved away when I was ten.
21. She telephoned her best friend to vent her frustration.
22. Honesty has always been his best friend.
23. He was cuckolded by his best friend.
24. My best friend lives across the road.
25. I count him as my best friend.
26. She's gone off with her husband's best friend.
27. She was my best friend in college.
28. At one time Emily was my best friend.
29. Her plans to make him jealous backfired on her when he went off with her best friend.
30. He can't forgive her for doing the dirty on him and having an affair with his best friend.
More similar words: friend, friendly, boyfriend, girlfriend, unfriendly, friendship, bosom friend, make friends with, best, orient, at best, bestow, had best, nutrient, best of all, bestowed, for the best, experience, experienced, orientation, disoriented, priest, best-selling, be strict with, fiendish, disorientation, manifest destiny, thirst for, boastful, wistfully.