protective secretion of the mucous membranes; in the gut it lubricates the passage of food and protects the epithelial cells; in the nose and throat and lungs it can make it difficult for bacteria to penetrate the body through the epithelium
a stolen base; an instance in which a base runner advances safely during the delivery of a pitch (without the help of a hit or walk or passed ball or wild pitch)
steal a base
move stealthily; "The ship slipped away in the darkness"
take without the owner's consent; "Someone stole my wallet on the train"; "This author stole entire paragraphs from my dissertation"