What is the opposite of tongue?

There isn't a single perfect opposite for "tongue" because it has multiple meanings. Here are a few possibilities, depending on the context:

Literal Meaning:

* Palate: The roof of the mouth, which is the opposite surface to the tongue.

* Teeth: The structures in the mouth that oppose the tongue in chewing and speaking.

Figurative Meaning:

* Silence: If "tongue" means the ability to speak, then silence is the opposite.

* Honesty: If "tongue" refers to deception or lies, then honesty is the opposite.

* Kindness: If "tongue" signifies harsh or hurtful words, then kindness is the opposite.

Which opposite fits best depends on what you're trying to say.