► 副詞ぐらぐら  [(1)ぐらぐら]  [coll]    
meaning:  shake  rank: 2☆ 
大地震で
家が
グラグラ揺れた ⇨ The house shook wildly by the big earthquake  
(☛ A big but slow horizontal shaking)☆ この
机はぐらぐらしている ⇨ This desk wobbles, is unstable  
(☛ Something standing is unsteady because the legs are not firm)