A sidesplat is a
shot/effect in a film in which a character, usually while walking across a street in a somewhat distracted state of mind is suddently slammed by a fast moving vehicule that explodes into the frame from offscreen left or right.
The
shot often begins quietly , sometimes in slow
motion, before a sudden burst of sound of the motor screaming, tires screeching, and/or
horn of the vehicule. This of course adds to the jolting effect of the regular speed visual of the crash.
There are several examples of this effect from different movies.