Weakness of the muscles responsible for dorsiflexion of the foot, that is, of the movement of the toes towards the shin. The foot dorsiflexors include the tibialis anterior, the extensor hallucis longus, the extensor digitorum longus, and the peroneus tertius muscles. The phenotype is Foot dorsiflexor weakness (HP_0009027, a Human Phenotype Ontology entry). Also known as: Foot drop, Foot extensor weakness, Footdrop, Inability to heel walk, Inability to walk on heels.