flying start

build the plane while flying it

To develop one's approach or strategy to a project while carrying out that project, and not beforehand.

flying visit

A very short visit.

fresh start

A new beginning, without prejudices.

head start

An advantage consisting in starting a competition or task earlier than might be expected; given (or taken), for example, prior to the beginning of a race.

if I'm not there, start without me

I am not interested in the event and do not plan to attend.

running start

An initial advantage at the beginning of some action or pursuit; a head start.

start a family

To conceive one's first child

start a fresh hare

To divert a discussion or argument from its conclusion.