Shelve: decide not to proceed with (a project or plan), either temporarily or permanently
Lose steam/Fizzle out: to lose energy
Sentence example: In Bangladesh, the proposal for a National Police Bureau of Counter Terrorism, for example, had been virtually shelved for five years, and a nationwide campaign to create public awareness against radicalism lost steam years ago. A nationwide socio-political and religious campaign involving imams and teachers initiated by the caretaker government in 2007 to 2008 had fizzled out.
The Power Memory Strategy:
- Shelve: put on the bookshelf and never visit it for a short or long time
- Lose steam: steam is a form of energy. Lose steam is similar to fizzle out ⇒ the carbon dioxide in the can of Coca Cola fizzled out.