hit the ground running

common ground

A characteristic or interest shared by multiple people or systems; any belief, etc. held in common.

don't let the door hit you on the way out

Used as a command to leave in haste, or to indicate that one is glad, or at least unmoved, to see the addressed person leaving.

ear to the ground

The practice or characteristic of carefully gathering information; a state or mindset of attentiveness.

eyes on the ground

One or more observers in an area of interest.

facts on the ground

The situation in reality as opposed to in the abstract.

fall out of the ugly tree and hit every branch

To become extremely unattractive.

from the ground up

From the beginning; starting with the basics, foundation, or fundamentals.

get off the ground

To succeed or begin to succeed.