
zwei
two
The cardinal number that comes between one and three; the numeral 2.
Ich habe zwei Äpfel gekauft.
I bought two apples.
two
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two
The cardinal number that comes between one and three; the numeral 2.
Ich habe zwei Äpfel gekauft.
I bought two apples.

a couple
Used colloquially to refer to a small, indefinite number of things or people.
Ich brauche nur noch ein, zwei Minuten, dann bin ich fertig.
I just need another minute or two, then I'll be finished.
To avoid confusion with the number 'drei' (three), 'zwo' is often said instead of 'zwei' (two) on the phone, in radio communication, or in the German armed forces. In everyday life, however, 'zwei' is the usual form.
Meine Telefonnummer ist fünf-neun-zwo-acht.
My phone number is five-nine-two-eight.
In written language and in formal contexts, 'zwei' (two) can take the genitive form 'zweier'. It is used to express possession or belonging.
Die Entscheidung zweier Richter stand am Ende fest.
The decision of two judges was final in the end.
The combination 'ein, zwei' (one or two) is used as a fixed expression to indicate a small, imprecise amount. It means “a couple” or “a few.”
Ich habe da noch ein, zwei Fragen zu dem Thema.
I still have one or two questions about the topic.
both
Zwei (two) and beide (both) can refer to two people or things. Zwei only states the number and can also refer to a subset, whereas beide refers to one and the other together and therefore denotes the complete pair. Use beide when no one or nothing from the pair is left out.

Ich nehme zwei der vier Tassen aus dem Schrank.
I’m taking two of the four cups out of the cupboard.
Ich nehme beide Tassen aus dem Schrank, weil nur zwei dort stehen.
I’m taking both cups out of the cupboard because there are only two in it.