to ally
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to ally oneself
To enter into an alliance or union with someone in order to achieve a common goal, often against a common opponent.
Die beiden Unternehmen verbündeten sich, um gegen den Marktführer konkurrieren zu können.
The two companies allied themselves in order to compete against the market leader.
'Verbünden' (to ally) is a reflexive verb and is always used with a reflexive pronoun: 'sich verbünden' (to ally oneself). The pronoun changes according to the person: 'ich verbünde mich' (I ally myself), 'wir verbünden uns' (we ally ourselves).
Ich verbünde mich nicht mit deinem Gegner.
I am not allying myself with your opponent.
The verb 'verbünden' (to ally) is closely related to the noun 'der Bund' (alliance, union). 'Sich verbünden' literally means to form an alliance or union.
Die beiden Parteien schlossen einen Bund für die nächste Wahl.
The two parties formed an alliance for the next election.
The structure is often: 'sich mit jemandem verbünden' (to ally oneself with someone). If there is a common opponent, it is added with the preposition 'gegen': 'sich mit jemandem gegen jemanden verbünden' (to ally oneself with someone against someone).
Die Rebellen verbündeten sich mit den Nachbarstämmen gegen die Regierung.
The rebels allied themselves with the neighboring tribes against the government.
to connect / to bandage
'sich verbinden' and 'sich verbünden' can both mean that people or groups act together. 'sich verbinden' is more general and describes joining together for a shared goal. 'sich verbünden' is more specific: it means forming an alliance or union, often against an opponent or a shared problem. The words are easy to confuse because they look similar and both express cooperation. If it is only about cooperation or joining together, 'sich verbinden' fits; if it is about a clear alliance with a shared strategy, 'sich verbünden' is more precise.
Vor der Abstimmung haben sich mehrere kleine Parteien verbündet.
Before the vote, several small parties allied themselves.
Die Eltern verbinden sich, um den Spielplatz im Viertel zu verbessern.
The parents unite to improve the playground in the neighborhood.