I. verb
1.
Synonyms: clash 2, conflict, disaccord, discord, disharmonize, jangle, mismatch
2.
Synonyms: shake 2, quake, tremble, tremor, vibrate
II. noun
Synonyms: impact 1, bump, clash, collision, concussion, crash, jolt, jounce, shock, smash
Related Word: fluctuation, sway, vibration; agitation, disturbance, upset