挚友指的是非常亲密的朋友，是指和自己有着深厚感情、彼此信任、相互扶持的好朋友。挚友通常是一起经历过许多事情，分享过许多秘密，相互理解和包容的人。挚友之间没有距离和隔阂，可以毫无保留地交流，彼此支持和鼓励。

How to pronounce: zhì yǒu

Usage:

挚友可以用来形容两个人之间的关系，也可以用来形容一个人对另一个人的感情。通常用在口语中或者书面语中表达对朋友的称呼。

Example sentences:

1. 我们从小就是挚友，无论发生什么事情都会彼此支持。

We have been best friends since childhood, and we always support each other no matter what happens.

2. 她是我的挚友，我相信她能够帮我度过难关。

She is my best friend, I believe she can help me get through tough times.

3. 他们两个人之间有着非常深厚的感情，可以说是真正的挚友。

They have a very strong bond between them, they can be considered as true best friends.

4. 我们虽然不在同一个城市，但我们依然保持着挚友之间的。

Even though we are not in the same city, we still keep in touch as best friends.

5. 她是我最好的挚友，我可以和她分享任何事情。

She is my closest best friend, I can share anything with her.

Synonyms and usage:

1. 好友 (hǎo yǒu) - refers to a friend who has a good relationship with you, but may not be as close as a best friend.

2. 亲密朋友 (qīn mì péng yǒu) - refers to a friend who is very close and intimate, but may not necessarily have the same level of trust and support as a best friend.

3. 心腹之交 (xīn fù zhī jiāo) - refers to someone who is like a confidant or trusted companion, similar to the role of a best friend.

4. 老友 (lǎo yǒu) - refers to an old friend who has known you for a long time, but may not necessarily have the same level of closeness as a best friend.

5. 形影不离的朋友 (xíng yǐng bù lí de péng yǒu) - refers to someone who is always by your side and inseparable, similar to the role of a best friend.

Editor's summary:

挚友是指非常亲密、信任和支持彼此的好朋友，通常用来形容两个人之间的关系或者一个人对另一个人的感情。它可以和其他词语如好友、亲密朋友等进行区分，而同义词如心腹之交、老友等则可以作为替换词来使用。挚友之间没有隔阂和距离，可以毫无保留地交流和支持，是人生中非常宝贵的存在。