Hvad med at trille bowlingkuglen langsommere?

It is a very common Danish way to make a suggestion. Here, Hvad med at ... means something like How about ...?

So Hvad med at trille bowlingkuglen langsommere? is not really asking for information. It is suggesting an action.

After Hvad med when you suggest an action, Danish normally uses at + infinitive.

So:

• at trille = to roll
• Hvad med at trille ...? = How about rolling ...?

Even though English often uses an -ing form after How about, Danish uses at + infinitive here.

Trille means to roll, especially for something round that moves along a surface, such as a ball.

In this sentence, it fits well because a bowling ball is something you roll along the lane.

A native English speaker may also notice that Danish has another verb, rulle, which can also mean roll. In many contexts both are possible, but trille often feels especially natural for balls, wheels, or small rolling movement.

Because Danish normally writes compound nouns as a single word.

So:

• bowling
  • kugle = bowlingkugle
• bowlingkuglen = the bowling ball

This is very normal in Danish. English often separates words where Danish joins them.

The -n is the definite ending, meaning the.

The base noun is:

• en kugle = a ball

The definite form is:

• kuglen = the ball

Since bowlingkugle is also a common-gender noun, its definite singular form is:

• bowlingkuglen = the bowling ball

So instead of using a separate word for the, Danish often adds the definiteness to the end of the noun.

Because langsommere is the comparative form.

• langsomt = slowly
• langsommere = more slowly

So the sentence is not just saying roll the bowling ball slowly. It is saying roll the bowling ball more slowly than before, or more slowly than you are doing now.

That word order is very natural in Danish.

Here the structure is:

• at trille = infinitive verb
• bowlingkuglen = object
• langsommere = adverb

So the phrase is built like:

at trille bowlingkuglen langsommere

That is a normal way to say to roll the bowling ball more slowly. The adverb often comes after the object in this kind of phrase.

Because Hvad med at ... is a fixed expression.

In a regular Danish question, you often expect a finite verb early in the sentence. But here Hvad med works more like a set phrase meaning How about, and the action comes afterward in an infinitive clause:

• at trille bowlingkuglen langsommere

So this is not built like a standard information question such as Hvad gør du? It is a suggestion pattern.

It is more of a suggestion.

The question mark is there because the speaker is proposing something and inviting a response, but functionally it means:

• How about rolling the bowling ball more slowly?

Depending on tone, it can sound:

• friendly
• helpful
• cautious
• mildly critical

So the grammar is question-like, but the communicative purpose is usually to suggest.

Yes, you often could.

Hvad med at rulle bowlingkuglen langsommere? would also be understandable and fairly natural.

But trille is a very good choice here because it matches the idea of a ball rolling along a surface. In many everyday situations, trille feels especially fitting for round objects.

Yes, it is natural Danish.

Hvad med at ... is very common and standard. It is not especially formal, but it is not slang either. It works well in normal conversation and in everyday written Danish.

So the sentence sounds natural, neutral, and idiomatic.