I'd also like to submit the idea that the word "wiggle" is the best available English word to describe the seemingly-random movements of particles due to internal motion that lead to collisions.
Recently, I've been thinking to myself that (outside of Epicurean discussions) I only ever invoke the word "swerve" when referring to (1) the object of "my car", and (2) "an intentional re-direct to avoid a collision". The clinamen is a proposition that explains why collisions occurred in the first place, so "swerve" in my vernacular is devilishly misleading.
Other candidates might include "jerk", "shimmy", "twitch", and "wag".