To form a small group.
to become friends with.
To be a member of (a gang, hooligan firm, etc.); to associate with a, typically disreputable, individual or group.
Used other than figuratively or idiomatically: see run, with.
To take an incomplete or inadequate (plan, text, etc.) and develop it further, often with the implication of carelessness.
To follow something through to completion or realization.
To be streaming with a fluid.