Onset
Part of speech: verb
Definition: To assault; to set upon. To set about; to begin.
Part of speech: noun
Definition: A rushing or setting upon; an attack; an assault; a storming; especially, the assault of an army. The initial phase of a disease or condition, in which symptoms first become apparent. The initial portion of a syllable, preceding the syllable nucleus. The beginning of a musical note or other sound, in which the amplitude rises from zero to an initial peak. A setting about; a beginning. Anything set on, or added, as an ornament or as a useful appendage.
Onrush
Part of speech: noun
Definition: A forceful rush or flow forwardAn aggressive assault