I forgårs talte min mor om et gammelt uheld, hvor hun også slog hoften.

I forgårs means the day before yesterday.

It is a fixed time expression in Danish:

• i går = yesterday
• i dag = today
• i morgen = tomorrow
• i forgårs = the day before yesterday
• i overmorgen = the day after tomorrow

The i is just part of the expression here. It does not translate neatly as a separate English word in this phrase.

Because Danish main clauses usually follow the V2 rule: the finite verb must come in the second position.

So when a time phrase like I forgårs is moved to the front, the verb talte must come next:

• Min mor talte om et gammelt uheld i forgårs.
• I forgårs talte min mor om et gammelt uheld.

Both are correct, but the second version emphasizes the time expression more.

The verb tale om means to talk about.

So:

• tale = to speak / talk
• tale om = to talk about

This is just the normal preposition used with this meaning. English speakers often need to learn which preposition a Danish verb takes, because it does not always match English perfectly.

Because uheld is a neuter noun in Danish, so it takes et.

That affects both the article and the adjective:

• et uheld = an accident / a mishap
• et gammelt uheld = an old accident

The adjective gammel becomes gammelt because it agrees with a singular neuter noun.

Compare:

• en gammel bil = an old car
• et gammelt hus = an old house

Not exactly.

Uheld usually means accident, mishap, or unfortunate incident. It can sound a bit broader and sometimes milder than ulykke.

Very roughly:

• uheld = accident / mishap
• ulykke = accident, often more serious

In this sentence, et gammelt uheld suggests some accident or mishap from the past.

Because hvor hun også slog hoften is a subordinate clause that adds information about et gammelt uheld.

Danish normally uses a comma before this kind of clause:

• ..., hvor ...
• ..., som ...
• ..., fordi ...

So the comma helps mark that the sentence is moving into extra descriptive information.

Here hvor introduces a relative clause and means something like where or in which.

So:

• et gammelt uheld, hvor hun også slog hoften means
• an old accident where/in which she also hurt her hip

In English, using where with events is also possible in some contexts, but Danish uses hvor quite naturally here to connect the accident with what happened during it.

Because this is a subordinate clause: hvor hun også slog hoften.

In Danish subordinate clauses, the word order is different from main clauses. You do not use the usual main-clause inversion/V2 pattern. A common order is:

subject + adverb + verb

So:

• hun også slog hoften

That placement of også means she also hurt her hip.

Literally, slå often means hit or strike. But in sentences about accidents, it can also mean hurt, injure, or bang a body part.

So hun slog hoften is best understood as:

• she hurt her hip
• she banged her hip
• she injured her hip

It does not necessarily mean she intentionally hit something.

Danish often uses the definite form of a body part when the owner is obvious from the context.

So:

• hun slog hoften = literally she hurt the hip, but naturally she hurt her hip

This is very common in Danish with body parts:

• Han brækkede armen. = He broke his arm.
• Hun slog hovedet. = She hit her head.

Using sin hofte is possible in some contexts, but here hoften sounds more natural.

Because the sentence describes past events:

• I forgårs sets the conversation in the past.
• The accident is also being referred to as something that happened earlier.

So:

• talte = talked
• slog = hurt / hit

Both are simple past forms in Danish.

Yes, often you could.

• talte om = talked about
• snakkede om = talked about

But there is a slight tone difference:

• tale can sound a bit more neutral or slightly more formal
• snakke is often more informal and conversational

In this sentence, both would be understandable:

• I forgårs talte min mor om ...
• I forgårs snakkede min mor om ...

The original version with talte is completely natural.