succussation

in order, by a more frequent and a more convulsive elevation and depression of the diaphragm, and the succussations of the intercostal and abdominal muscles in laughter, to drive the gall and other bitter juices from the gall bladder

They rode, but authors having not / Determin'd whether pace or trot, / That is to say, whether tollutation, / As they do term't, or succussation […]