■ noun
1》 a person who sits, especially for a portrait or examination.
↘a sitting hen.
2》 [usu. in combination ] a person who looks after children, pets, or a house while the parents or owners are out or away: a house-~.
↘a person who provides care and companionship for people who are ill.
3》 Brit. informal (in sport) an easy catch or shot.