I . n.
1.
Reverberating report ( of a discharge of atmospheric electricity ).
2.
Loud noise, roar, rumbling, boom, detonation.
3.
Alarming threat, startling denunciation, fulmination.
II . v. n.
1.
Sound, rattle, roar, roll, boom.
2.
Make a loud noise, detonate.
III . v. a.
Utter threateningly, fulminate, hurl.