in addition / toward it
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in addition
Expresses an addition; additionally, moreover. Often used in connection with 'kommen' (to come) or 'fügen' (to add).
Die Miete ist schon hoch, und hinzu kommen noch die Nebenkosten.
The rent is already high, and in addition there are the service charges.
The adverb 'hinzu' is composed of the words 'hin' (movement toward a place) and 'zu' (direction). So it literally describes a movement or conceptual addition 'there toward it'.
Zum Hauptgericht gab es einen Salat und hinzu bestellte ich ein Glas Wein.
With the main course there was a salad, and in addition I ordered a glass of wine.
When 'hinzu' stands at the beginning of a sentence, the verb follows directly after it. This structure is often used with the verb 'kommen' (to come) to introduce an additional point or argument.
Das Hotel war teuer. Hinzu kam, dass das Zimmer nicht sauber war.
The hotel was expensive. In addition, the room was not clean.
'Hinzu' is very frequently used with the separable verbs 'hinzukommen' (to be added/to come in addition) and 'hinzufügen' (to add). With 'hinzukommen', 'hinzu' separates from the verb in a main clause.
Zu den bereits genannten Problemen kommen noch weitere hinzu.
Additional problems are added to the ones already mentioned.
The meaning of movement toward a place is rare today and sounds formal or outdated. It is hardly used anymore in modern German.
Die Kinder liefen zum Zaun hinzu, um die Tiere besser zu sehen.
The children ran toward the fence to see the animals better.
to that / additionally
'dazu' and 'hinzu' can both express that something is being added. 'dazu' is very flexible in everyday language and refers to something that has already been mentioned. 'hinzu' sounds somewhat more formal and appears especially often in fixed combinations like 'hinzukommen' (to be added / to come in addition) or 'hinzufügen' (to add). Learners may confuse the words because both refer to an addition. In normal conversations, 'dazu' is often more natural. 'hinzu' fits well when something is added to a list, a group, or an amount.
Ich füge der Einkaufsliste noch Brot und Käse hinzu.
I'm adding bread and cheese to the shopping list.
Zum Problem mit dem Bus kommt dazu, dass heute viele Straßen gesperrt sind.
In addition to the problem with the bus, many streets are closed today.