get a head start
see head start.
Wearing A Cat On Your Head: Animal Idioms From Around The WorldDo you move at a snail’s pace, or get ants in your pants when it’s raining cats and dogs? You know those sayings, but here are a few from around the world.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.