verdoppeln
to double
To increase something in its amount, number, or size to twice as much.
Das Unternehmen konnte seinen Gewinn im letzten Quartal verdoppeln.
The company was able to double its profit in the last quarter.

to double
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to double
To increase something in its amount, number, or size to twice as much.
Das Unternehmen konnte seinen Gewinn im letzten Quartal verdoppeln.
The company was able to double its profit in the last quarter.

The verb 'verdoppeln' (to double) is made up of the prefix 'ver-' and the word stem 'doppel' (from 'doppelt', meaning double). The prefix 'ver-' often describes a process or change here, so the process of making something double.
Durch die neue Werbekampagne wollen wir die Verkaufszahlen verdoppeln.
With the new advertising campaign, we want to double sales figures.
You can use 'verdoppeln' actively with an accusative object when someone or something doubles an amount. You can also use it reflexively when an amount grows by itself.
Der Bäcker hat die Produktion von Brot verdoppelt. (aktiv)
The baker doubled the production of bread. (active)
'Verdoppeln' is often used in economic or statistical contexts. Typical nouns are 'den Gewinn' (the profit), 'den Umsatz' (the revenue), 'den Einsatz' (the stake), 'die Zahl' (the number), or 'die Menge' (the amount).
Wenn du beim Kartenspiel gewinnst, kannst du deinen Einsatz verdoppeln.
If you win at the card game, you can double your stake.
to rise / climb
'steigen' and 'verdoppeln' both have to do with an increase. 'steigen' is general: something becomes more, but you do not automatically know how much more. 'verdoppeln' is more precise and means that something becomes twice as large, twice as much, or twice as numerous. That is why a number can rise without doubling. Use 'verdoppeln' only when the increase is exactly or approximately to double the amount.

Innerhalb eines Jahres hat sich die Zahl der Mitglieder verdoppelt.
Within a year, the number of members doubled.
Die Zahl der Anmeldungen steigt kurz vor Kursbeginn.
The number of registrations rises shortly before the course begins.