Engine room noun phrase
The most important or influential part of a group or organization
Tim is our team's engine room, and everyone loves him.
Ho Chi Minh city is generally regarded as the engine room of the Vietnam economy.
To become important or obvious
In a very prominent position, where it attracts attention
A resource that will allow the possessor to access to power, knowledge or understanding
Used to describe something that has great influence or importance
people often do irrational or foolish things when they are in love.
I and my boyfriend have decided to get married in the summer. I don't think that's wise, since we won't have enough money saved by then to set up house. But then, one cannot love and be wise.