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 team up / put together
Sich verbünden and sich zusammentun both mean pursuing a common goal together. Verbünden, however, emphasizes an alliance, often against a common opponent. Zusammentun is more general and fits situations in which people simply work together to complete a task, without an alliance or opponent being important.
Die beiden Gruppen verbündeten sich gegen den gemeinsamen Gegner.
The two groups allied against their common opponent.
Die beiden Gruppen taten sich zusammen, um die Aufgabe schneller zu erledigen.
The two groups teamed up to complete the task more quickly.
