fly like a rock
- (simile, sometimes sarcastic) to travel through the air with little or no benefit from aerodynamic lift
- If the wings aren't big enough, your paper airplane will fly like a rock.
1970, American Association of Physics Teachers, The Physics teacher, Volumes 8-9, page 541:
- When students have compared the wing areas and weights by squaring and cubing the linear ratios, they correctly predict the large one will fly "like a rock"...