Definition of bolters:
(n) :
A person or thing that bolts, or runs suddenly.
(n) :
(botany, horticulture) A plant that grows larger and more rapidly than usual.
(n) :
(flour milling) A machine or mechanism that automatically sifts milled flour.
(n) :
A person who sifts flour or meal.
(n) :
(petroleum refining) A filter mechanism.
(n) :
(Australia, sports) An obscure athlete who wins an upset victory.