A person who behaves in a servile manner, such as a sycophantic employee or a fawning lover.
A small toy dog, kept as household pet, whose light weight and companionable temperament make it both suited and disposed to spend time resting in the comfort of its master's lap; a dog bred to behave in this manner.
One who knowingly allows himself or herself to be used for another's profit; a dupe.
A magician's assistant who pretends to be a member of the audience.
A confederate; a person who is secretly working for the researcher, unknown to the study participant.
A straight man.
A secret informant for police.
To act as a straight man.