Thrice on my breast I spit, to guard me safe

From fascinating charms.

Theocritos.

To unbewitch the bewitched, you must spit into the shoe of your right foot.--Scot, Discoverie of Witchcraft (1584).

Spitting for luck is a most common superstition.

Fishwomen generally spit upon their hansel.--Grose.

A blacksmith who has to shoe a stubborn horse, spits in his hand to drive off the “evil spirit.”

The swarty smith spits in his buckthorne fist.

Browne, Britannia’s Pastorals, i.

If a pugilist spits in his hand, his blows will be more telling.--Pliny, Natural History, xxviii. 7.