run out of steam

US /rʌn aʊt əv stiːm/
UK /rʌn aʊt əv stiːm/
"run out of steam" picture
1.

an Schwung verlieren, müde werden, die Puste ausgehen

to lose energy or enthusiasm and stop doing something, or to become tired and less effective

:
The project started strong, but it seems to be running out of steam now.
Das Projekt begann stark, aber es scheint jetzt an Schwung zu verlieren.
After working for ten hours, I started to run out of steam.
Nach zehn Stunden Arbeit begann ich, müde zu werden.