reparieren
to repair
To restore a damaged or defective object to a functioning condition.
Der Techniker kommt morgen, um die Waschmaschine zu reparieren.
The technician is coming tomorrow to repair the washing machine.

to repair
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to repair
To restore a damaged or defective object to a functioning condition.
Der Techniker kommt morgen, um die Waschmaschine zu reparieren.
The technician is coming tomorrow to repair the washing machine.

Many verbs that come from other languages end in '-ieren'. These verbs are regular and form the past participle without the prefix 'ge-'. So the form is 'repariert' (repaired), not 'gerepariert'.
Hast du dein Fahrrad schon repariert?
Have you repaired your bicycle yet?
'Reparieren' (to repair) is a transitive verb and almost always needs an accusative object. You always repair 'etwas' (something).
Kannst du bitte die kaputte Lampe reparieren?
Can you please repair the broken lamp?
You typically repair technical devices, vehicles, or damaged objects. Common combinations are: 'ein Auto reparieren' (to repair a car), 'ein Fahrrad reparieren' (to repair a bicycle), 'ein Dach reparieren' (to repair a roof), or 'eine Uhr reparieren' (to repair a watch/clock).
Mein Computer ist kaputt, ich muss ihn reparieren lassen.
My computer is broken; I need to have it repaired.
to wait / maintain
'warten' and 'reparieren' can both have to do with devices, machines, or objects. 'warten' means that you regularly check and maintain something so that it does not break. 'reparieren' is used when something is already broken or damaged and should work again. The words are easy to confuse because both kinds of work are often done by technicians or in a workshop. Put simply: you maintain a device as prevention; you repair it after a defect.

Er hat das Fahrrad repariert, weil die Bremse nicht mehr funktionierte.
He repaired the bicycle because the brake no longer worked.
In der Pause wartet der Hausmeister die Kaffeemaschine.
During the break, the caretaker maintains the coffee machine.