WOBBLE

[verb] - to (cause something to) shake or move from side to side in a way that shows a lack of balanceI wouldn't use that bookcase if I were you because it wobbles whenever you put anything on it. [I]You'll spill my coffee if you wobble the table like that! [T]His many fat chins wobble when he laughs. [I]I wish he wouldn't try to reach high notes because his voice always wobbles when he sings them. [I](figurative) The company's shares wobbled with the news of a foreign take-over bid. [I]