1) One hoping to get picked up 2) One looking for a free ride 3) One looking for a ride 4) One with a pick-up line 5) Passenger 6) Rider 7) Roadside sight 1) Rider 2) Traveller 
A gene that has no selective advantage, or may even be harmful, but that nevertheless temporarily becomes widespread because it is closely linked and coupled with a highly advantageous gene that is strongly selected. ... (05 Mar 2000) ... 
Type: Term Pronunciation: hitch′hīk-ĕr Definitions: 1. A gene that has no selective advantage, or may even be harmful, but that nevertheless temporarily becomes widespread because it is closely linked and coupled with a highly advantageous gene that is strongly selected.
[n] - a person who travels by getting free rides from passing vehicles