Definitions
1.verbTo burn with no flame and little smoke.
2.verbTo show signs of repressed anger or suppressed mental turmoil or other strong emotion, such as passion.
3.verbTo exist in a suppressed or hidden state.
4.verbTo smother; to suffocate; to choke.
5.noun(sometimes figurative) The act by which something smoulders; residual heat."the smoulderings of the Thirty Years War"