A falling on or upon; an attack, onset, or assault.
The fall of the evening.
A fall of rain or snow.
To fall on or upon.
To assault, attack.
(When contrasted with sexual assault.) A physical attack of a sexual nature involving penetration (as apposed to sexual assault which may not involve actual penetration).
A broad term encompassing sexual assault, harassment, indecent assault, rape, and other sexual offences.