Ĵetu la ĵetkubon.

Ĵetu is the command form of the verb ĵeti, meaning to throw.

The ending -u is the Esperanto verb ending for the volitive mood. In practice, this is the form used for commands, requests, and similar ideas:

• ĵeti = to throw
• ĵetu = throw! / let someone throw

So Ĵetu la ĵetkubon is a command: Throw the die or, in game context, Roll the die.

In Esperanto, commands often leave out the subject, just like English does:

• Throw the die.
• Ĵetu la ĵetkubon.

The understood subject is usually vi = you, but it does not need to be said.

If you wanted to include it, you could say:

• Vi ĵetu la ĵetkubon.

But that is less neutral and usually only used for emphasis or contrast.

The -n marks the direct object. That means it shows what is being thrown.

In this sentence:

• ĵetu = throw
• la ĵetkubon = the die

Because the die is the thing receiving the action, it takes the accusative ending -n.

Compare:

• La ĵetkubo falas. = The die falls.
• Ĵetu la ĵetkubon. = Throw the die.

In the first sentence, ĵetkubo is the subject, so no -n. In the second, it is the object, so it becomes ĵetkubon.

Because la never changes.

Esperanto has only one definite article: la, and it stays the same in all situations:

• la ĵetkubo
• la ĵetkubon
• la ĵetkuboj
• la ĵetkubojn

The noun changes when needed, but the article does not.

Ĵetkubo is a compound word:

• ĵeti = to throw
• kubo = cube

So ĵetkubo literally means something like throw-cube.

This is the normal Esperanto word for a gaming die.
The plural is ĵetkuboj = dice.

This kind of word-building is very common in Esperanto.

A useful approximation is:

ZHEH-too lah zhet-KOO-bon

A few key points:

• ĵ sounds like the s in measure or the j in French jour
• e is like e in met
• u is like oo in food
• o is like a clear o, not a reduced English schwa

Stress in Esperanto is always on the second-to-last syllable of a word:

• ĴE-tu
• ĵet-KU-bon

So the full sentence is pronounced roughly:

ĴE-tu la ĵet-KU-bon

Yes, you could say Ĵetu ĵetkubon, but it would sound less natural in many situations.

La means the, so la ĵetkubon means the die. In a typical game situation, there is a specific die already present, so the definite article makes sense.

Using no article can sometimes sound more general or less specific. In many real contexts, Ĵetu la ĵetkubon is the more natural choice.

So:

• Ĵetu la ĵetkubon. = Throw/roll the die.
• Ĵetu ĵetkubon. = Throw a die / throw die, depending on context

It can function as roll the die in context, especially in games.

Literally, ĵeti means to throw. But when talking about dice, English often says roll the die, while Esperanto commonly uses ĵeti for that game action.

So even though the literal sense is throw, the practical meaning in a board-game setting is often roll.

Yes. Esperanto word order is fairly flexible because the endings show the grammatical roles.

The most neutral order here is:

• Ĵetu la ĵetkubon.

But you could also say:

• La ĵetkubon ĵetu.

That is less neutral and gives special emphasis to the die.

Because ĵetkubon has -n, you can still tell it is the object even if it moves.

By itself, ĵetu is a straightforward command. It is not automatically rude, but it can sound direct.

If you want to sound more polite, Esperanto often adds words such as:

• Bonvolu ĵeti la ĵetkubon. = Please throw/roll the die.
• Ĉu vi povus ĵeti la ĵetkubon? = Could you throw/roll the die?

So ĵetu is fine for plain instructions, but there are softer options if needed.

The singular noun is:

• ĵetkubo = one die

The plural is:

• ĵetkuboj = dice

And if it is a direct object, the plural also takes -n:

• ĵetkubojn = dice, as a direct object

So:

• Ĵetu la ĵetkubon. = Roll the die.
• Ĵetu la ĵetkubojn. = Roll the dice.