RUN OVER (1), CONTRIBUTE TO

run over = hit someone with a vehicle

 examples:

• Did you see that? That car nearly ran over the child.
• He was run over and seriously injured.
• He was run over and killed in 2009.
• She was run over by a truck as she was crossing the street.
• You nearly ran me over!
• You nearly ran over that poor cat!

contribute to = is a serious cause
examples: 

• Junk food contributes to fattening. Stop eating it if you want to lose weight!
• Smoking contributes to heart diseases.
• His drinking problem contributed to his death.
• The collapse of his company contributed to his depression.
• The fact that she liked the new school and teachers contributed to her improvement at school.
• He is very hard-working. This has certainly contributed to his success.