Definitionen
1.NounSomeone who sits, e.g. for a portrait.
2.NounOne employed to watch or tend something; a babysitter, housesitter, petsitter, etc."It's always such a pain to get a sitter on short notice."
3.NounA sitting room.
4.NounA participant in a séance who is not a medium.
5.NounA broody hen.
6.NounA very easy scoring chance."How could he miss that? It was an absolute sitter!"
7.NounSomeone who accompanies a person who is taking a psychedelic drug, to provide reassurance in case of a bad trip.