JMdict entry #1709510

1. noun (common) (futsuumeishi)noun or participle which takes the aux. verb suruintransitive verb vertical shaking (of an earthquake)
   see: 横揺れ・1
2. noun (common) (futsuumeishi)noun or participle which takes the aux. verb suruintransitive verb pitch (of a ship, aircraft, etc.); pitching
   see: ピッチング・2