Підборіддя під ротом.

In Ukrainian, the present-tense verb to be is usually omitted.

So English The chin is under the mouth becomes simply Підборіддя під ротом.

A fuller, very literal English gloss would be: chin under mouth

This is completely normal in Ukrainian, especially in simple descriptions, definitions, and labels.

Because the preposition під changes case depending on meaning.

Here it means a fixed location: under / below.
With that meaning, під takes the instrumental case.

• рот = nominative singular, mouth
• ротом = instrumental singular, under the mouth

So:

• під ротом = under the mouth
• not під рот

Підборіддя is in the nominative case.

It is the main thing being talked about: the chin.

So the structure is:

• Підборіддя — nominative
• під ротом — prepositional phrase showing location

Here під means under or below.

In body-part descriptions, English might sometimes prefer below:

• The chin is below the mouth

But Ukrainian naturally uses під in this kind of spatial description.

So під ротом is a normal way to say under the mouth / below the mouth.

It can function as a complete sentence, but it also feels very natural as a short descriptive label, especially in beginner materials, diagrams, or body-part vocabulary exercises.

In more formal punctuation, you might also see: Підборіддя — під ротом.

The dash helps show the idea The chin is under the mouth, but it is not always necessary in simple educational contexts.

You probably could be understood, but Підборіддя під ротом is more neutral and natural.

Ukrainian word order is flexible, but not random. The usual order here starts with the thing being identified and then gives its location:

Підборіддя під ротом
= The chin is under the mouth

If you put Під ротом first, it gives extra emphasis to the location, which is less natural in a basic naming sentence.

Ukrainian does not have articles like a or the.

So:

• підборіддя can mean a chin or the chin
• ротом can mean a mouth or the mouth, depending on context

In this sentence, the meaning is understood from the situation, so English usually translates it with the: The chin is under the mouth.

No. Під can take different cases depending on whether there is location or movement.

1. Location → instrumental

   • під ротом = under the mouth
   • під столом = under the table

2. Movement toward/under something → accusative

   • покласти під стіл = to put under the table

So in Підборіддя під ротом, there is no movement. It describes where the chin is, so the instrumental is used.

A rough pronunciation guide is:

pid-bo-RID-dya

A few useful points:

• the stress is on рі: підборі́ддя
• ддя is a soft cluster, something like dya
• і is like ee in see, but shorter and cleaner

So the end is not a hard dda, but closer to dya.

It is singular.

Підборіддя means chin.
Even though it ends in -я, it is a singular noun.

It is also a neuter noun.

So if you later use adjectives with it, they must agree with a neuter singular noun:

• мале підборіддя = a small chin

Normally, no. In a simple sentence like this, є would usually be omitted.

So the natural version is: Підборіддя під ротом.

Using є here would sound unnecessary or unnatural in most ordinary contexts:

• Підборіддя є під ротом — grammatical in a very literal sense, but not the normal way to say it

For beginner Ukrainian, it is best to learn:

• present tense to be is usually not said in sentences like this.