<def-root>While in motion, an <fen>Impactor</fen> makes sudden, forcible contact with the <fen>Impactee</fen>, or two <fen>Impactors</fen> both move, mutually making forcible contact. <ex><fex name="Impactor">The massive metal foot</fex> <t>hit</t> <fex name="Impactee">the ground</fex> <fex name="Result">with a huge thud</fex>.</ex> </def-root>
While in motion, an Impactor makes sudden, forcible contact with the Impactee, or two Impactors both move, mutually making forcible contact. The massive metal foot hit the ground with a huge thud.