Ki Teitzei - Keeping Quiet

And you shall keep a stake in addition to your weapons; and it shall be, when you sit down outside [to relieve yourself], you shall dig with it, and you shall return and cover your excrement.

וְיָתֵ֛ד תִּֽהְיֶ֥ה לְךָ֖ עַל־אֲזֵנֶ֑ךָ וְהָיָה֙ בְּשִׁבְתְּךָ֣ ח֔וּץ וְחָֽפַרְתָּ֣ה בָ֔הּ וְשַׁבְתָּ֖ וְכִסִּ֥יתָ אֶת־צֵֽאָתֶֽךָ

Devarim 23:14

The Gemarah in Ketubot explains this verse.

 Continuing with statements from Bar Kappara, the Gemarah says:

Bar-Kappara [also] expounded: What [is the meaning of what] is written. And thou shalt have a peg among thy implements? Do not read, thy implements,(From אזן azayn ‘implement, tool’) but ‘upon thy ear’;(As if from אוזן ozen ‘ear’) [this means to say] that if a man hears an unworthy thing he shall plug his finger (pointed like a peg) into his ears.

Ketubot 5A

Rabbi Yishmael continues and adds:

• Why is the lobe of the ear softer than the rest of the ear?
  So that if you hear something inappropriate, the lobe can be folded over to block sound from the ear. 
• Why is the lobe at the end of the ear?
  This is to teach that just as the lobe is at the end of the ear, so this symbolizes the end of argument. For any argument that is not for the sake of heaven will not stand. 
• Mentions 'the end' to teach us that it is better to abandon an argument and to pretend that you don't hear.

Context
Asks the Kli Yakar, where does Bar Kappara come from to seemingly twist the verse out of context, how does his interpretation relate to the rest of the passage?
The verse at the beginning of this section can relate to this concept.

When a camp goes out against your enemies, you shall beware of everything evil.

כִּֽי־תֵצֵ֥א מַֽחֲנֶ֖ה עַל־אֹֽיְבֶ֑יךָ וְנִ֨שְׁמַרְתָּ֔ מִכֹּ֖ל דָּבָ֥ר רָֽע

Devarim 23:10

Says the Kli Yakar, Chazal interpreted the words 'everything evil' (דבר רע) as evil speech (דיבור רע), that is that we should protect ourselves from Loshon Hara (evil speech).

And we see that Bar Kappara didn't explain what one needed to protect them self from, so the earlier verse comes to explain Bar Kappara explanation for why we need to put our fingers in our ears.

The Way Out 
One should hide himself, and stay hidden, and make himself as though he does not hear and be among the insulted rather than be an insulter - listen to chastisement and do not respond. This will silence any argument.

Just as one wise man said, I never lashed out at another man, not even one time. How? He never answered when he himself was insulted, this way he was able to end any argument. This is goes back to our verse, that he was able to "cover your excrement" (וְכִסִּ֥יתָ אֶת־צֵֽאָתֶֽךָ), that is the loshon hara and arguments are likened to 'excrement'.  This is the main point for what a person's weapon should be, for remaining silent and not answering will win.