Advance
You give your scooter to a turkey so that it can advance. The turkey was trying and failing to walk through a crowded street, so out of the goodness of your heart you gave it a scooter so it could advance.
Imagine picking up the turkey and putting it on your scooter. Of course, you give it your helmet as well, safety first.
しん
すす
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You wave as the turkey advances into the street at top speeds, collides with a car, and scrapes up its shins (しん) almost immediately. Ah!
Silly turkey, you can't advance that fast, of course you'll hurt your shins. It's better to advance slowly, but I guess I couldn't expect you to know that.