Welche Bedeutung steckt hinter der hier vorgestellten Vokabel aus dem Bereich Sales?

'I'm happy to say that sales of our XL version have increased 100% over the last month.' 'Yes, but sales of our medium version have unfortunately plummeted.'

to plummet

Do you know what it means?

• to remain small
• to fall at high speed
• to become useless