What does "send somebody crashing back down" means?
La frase completa es: caffeine will temporarily boost your mood and alertness but send you crashing back down as soon as its effect starts to wear off
3 Answers
Quiere decir que después de sentirse mejor por la cafeina, una persona va a estar lo mismo que antes o/y (posiblemente) peor después de un rato.
Gracias!
It just means that your temporary elevation in mood and alertness will drop suddenly.