Brillestangen er løs.

In Danish, -en is a very common definite singular ending for common-gender nouns. It works like English the attached to the end of the noun.

So:

• en brillestang = a glasses arm / a spectacle arm
• brillestangen = the glasses arm

This is one of the big differences from English: Danish often puts the at the end of the noun instead of using a separate word.

Because Danish usually expresses definiteness with a suffix on the noun.

So instead of saying something like the glasses arm, Danish says:

• brillestangen

That already includes the idea of the.

A separate definite word such as den is usually only added in certain situations, especially when there is an adjective before the noun:

• brillestangen = the glasses arm
• den løse brillestang = the loose glasses arm

So in your sentence, no separate the is needed.

It is a compound noun, which is extremely common in Danish.

It can be broken down like this:

• brille = glasses / spectacles
• stang = rod / bar / arm
• brillestang = literally something like glasses-arm
• brillestangen = the glasses arm

Danish often joins nouns together into one word where English might use two or more words.

Because adjectives in Danish often agree with the noun.

Here, brillestangen is:

• singular
• common gender

For a common-gender singular noun used with er as a predicate, the adjective usually has no ending:

• Stangen er løs.

If the noun were neuter singular, you would usually use -t:

• Hjulet er løst. = The wheel is loose.

If it were plural, you would usually use -e:

• Brillestængerne er løse. = The glasses arms are loose.

So løs is the correct form for brillestangen.

This is the normal word order in a simple Danish statement:

• Subject + verb + complement

So:

• Brillestangen = subject
• er = verb
• løs = complement/adjective

This is very similar to English:

• The glasses arm is loose.

Danish also follows the V2 rule in main clauses, meaning the finite verb usually comes in the second position. In this simple sentence, that gives the normal pattern you see here.

No. Løs has a range of meanings, just like English loose.

In this sentence, it means something like:

• not firmly attached
• wobbly
• loose

But in other contexts, løs can also mean things like:

• not fixed tightly
• not strict / not exact
• casual / relaxed, depending on context

So the exact meaning depends on what is being described. Here it is clearly the physical meaning.

The letter ø is one of the vowels English speakers often find difficult.

A rough guide:

• ø is pronounced with rounded lips
• your tongue is placed somewhat like for a sound between English eh and ur, but there is no exact English equivalent

For løs, the vowel is fairly long.

A rough imitation might be something like:

• lurse without the r
• or a rounded version of the vowel in French deux or German schön, if you know those

The exact pronunciation varies by accent, but the important point is that ø is not like English o.

A helpful learner-friendly breakdown is:

• brille ≈ BRIL-leh
• stangen ≈ STANG-en

Put together:

• BRIL-leh-stang-en

A few notes:

• The r in Danish is not like a strong English r
• The a in stang is more open than the English vowel in day
• The stress is usually strongest near the beginning of the compound, especially on brille-

You do not need perfect pronunciation immediately; getting the vowel sounds and rhythm roughly right is a good start.

The dictionary form is the indefinite singular noun:

• en brillestang

That is the form you would usually look up.

From there, other forms include:

• en brillestang = a glasses arm
• brillestangen = the glasses arm
• brillestænger = glasses arms
• brillestængerne = the glasses arms

So if you want to memorize vocabulary, memorize en brillestang.

You would say:

• En brillestang er løs.

That means A glasses arm is loose.

Compare:

• Brillestangen er løs. = The glasses arm is loose.
• En brillestang er løs. = A glasses arm is loose.

This contrast is useful because it shows the difference between:

• indefinite article: en
• definite ending: -en

The plural would be:

• Brillestængerne er løse.

Here several things change:

• brillestang → brillestænger = plural noun
• brillestænger → brillestængerne = definite plural
• løs → løse = plural adjective form

So:

• Brillestangen er løs. = singular
• Brillestængerne er løse. = plural

This is a good example of how both the noun and the adjective change in Danish.

It is understandable and correct, especially if you are talking about the arm/side piece of a pair of glasses.

Depending on context, native speakers might also use other related words, for example words referring to the frame or other parts of the glasses. But brillestang is a very reasonable word to know if you want to describe that specific part.

For a learner, the important thing is that it follows very normal Danish patterns:

• noun compound
• definite ending
• adjective agreement

So it is a useful sentence even beyond this exact piece of vocabulary.