noun
One who uses obsequious compliments to gain self-serving favour or advantage from another; a servile flatterer.
One who seeks to gain through the powerful and influential.
(obsolete) An informer; a talebearer.
verb
(transitive, obsolete) To inform against; hence, to calumniate.
(transitive, rare) To play the sycophant toward; to flatter obsequiously.