zurückholen
to get back
To bring something that you gave away, lost, or lent back into your possession.
Ich muss mein Buch, das ich dir geliehen habe, wieder zurückholen.
I need to get back the book that I lent you.

to get back
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to get back
To bring something that you gave away, lost, or lent back into your possession.
Ich muss mein Buch, das ich dir geliehen habe, wieder zurückholen.
I need to get back the book that I lent you.

'Zurückholen' (to get back/bring back) is a separable verb. The prefix 'zurück-', which indicates movement back to the starting point, comes at the end in a main clause. In subordinate clauses, the verb stays together.
Ich hole mein Fahrrad später bei dir zurück.
I'll get my bike back from your place later.
The object of the verb reveals the exact meaning. If it is an object, meaning 1 is meant. If the object is a person, meaning 2 is meant. With abstract things like 'Erinnerungen' (memories) or 'Gefühle' (feelings), meaning 3 is meant.
Sie will ihr altes Auto aus der Werkstatt zurückholen.
She wants to get her old car back from the repair shop.
When it is about memories or feelings, the subject of the sentence is often the trigger (e.g. a song, a place, a smell). The memory itself is the accusative object.
Dieses Lied holt die Erinnerungen an unseren ersten Urlaub zurück.
This song brings back the memories of our first vacation.
to repeat / retrieve
'wiederholen' and 'zurückholen' can mean the same thing in one sense: you bring something that was given away or lost back to yourself. In this sense, 'wiederholen' is separable: 'Ich hole das Buch wieder' (I get the book back). This can confuse learners because 'wiederholen' much more often also means 'to do or say again' and is then not separable. 'zurückholen' is clearer and more natural here when it is about possession or an object. 'wiederholen' in this meaning sounds more like 'etwas wieder holen' (to fetch something again / back).

Herr Richter holt sein Fahrrad aus der Werkstatt zurück.
Mr. Richter gets his bicycle back from the repair shop.
Ich hole meinen Schlüssel später bei der Nachbarin wieder.
I will get my key back from the neighbor later.