"Building bridges" is an idiom for bonding, suggesting the creation of connections and closeness between people or groups.
cooperative
This is not an idiom. It means just what it sounds like -- remain together in a group instead of separating.
The phrase "pull myself together" is an idiom.
The sentence is not, because an idiom is usually a phrase. The idiom is "do lunch," which means to have lunch together, usually while discussing business.
To figure somrthing out from the information avaiable
adds up, makes sense
Do what ever you want to do.
Don't go bananas when I tell you what I know.
Birds of a feather flock together, but all birds cannot fly.
When someone puts two and two together, they draw an obvious conclusion from what is known.
it means go to sleep