"To hitch a ride" means to get a free ride or transportation from someone else, usually by asking or signaling for a passing vehicle to stop and give you a lift to your destination. Full definition
Others hitch a ride on cargo ships or on the bottom of our shoes. (parksconservancy.org)
A major concern for long - duration space flight is how the microorganisms who hitch a ride with us will adapt to the loss of gravity. (newscientist.com)
The way to do that is to hitch a ride in your pocket or purse. (canadianbusiness.com)