Saliva is a watery substance formed in the mouths of animals, secreted by the salivary glands. Human saliva comprises 99.5% water, plus electrolytes, mucus, white blood cells, epithelial cells (which can be used to extract DNA), glycoproteins, enzymes (such as amylase and lipase), antimicrobial agents such as secretory IgA and lysozyme.
Take it on the arches does not mean simply Leave. It means Walk away. If Travis continues to break the chops of his dispatcher, he will not be driving a cab tonight. He will be walking home. I had no idea it was such an obscure term. It is dated, to be sure.
Definition of arch. 1  transitive verb. 2  1 : to cover or provide with an arch A bridge arches the stream. 3  2 : to form into an arch She arched her eyebrows. 4  intransitive verb. 5  1 : to form an arch Trees arch above the promenade. 6  2 : to take an arch-shaped course The ball arched toward the basket.