\Trem"bler\, n.
1. Any of certain West Indian birds of the genera
   {Cinclocerthia} and {Rhamphocinclus}, of the family
   Mimid[ae].

2. (Elec.) The vibrating hammer, or spring contact piece of a
   hammer break, as of the electric ignition apparatus for an
   internal-combustion engine.

\Trem"bler\, n.
One who trembles.