hold together

apron-string hold

An estate held by a man during his wife's life.

band together

to unite, to come together

bang some heads together

Attempt to get results from a previously ineffectual or argumentative group, typically by coercion or force.

birds of a feather flock together

People of similar character, background or taste tend to congregate or associate with one another; it is easier to establish friendships with people that one has a lot in common with.

bring together

To cause people to do something together; to bring about togetherness.

buy and hold

A passive investment strategy where an investor purchases an asset and retains it for many years, rather than trading it frequently.

don't hold your breath

Don't wait. Said cynically to suggest that what has just been mentioned is unlikely to happen soon or at all.

get one's act together

To become serious, organized, worthwhile, etc.