adverb, adverb taking the 'to' particle, na-adjective, noun or participle which takes 'suru'
trembling; shaking; chattering (of teeth)
Describes involuntary shaking from fear, cold, or nervousness. Often used with 震える or する.
寒くて歯がガクガクした。
My teeth were chattering from the cold.
彼は恐怖でガクガク震えていた。
He was trembling with fear.
adverb, adverb taking the 'to' particle, na-adjective, noun or participle which takes 'suru'
Describes something physically unstable, such as a loose joint or an unsteady object. Often used with する or なる.
この机の脚がガクガクする。
The legs of this desk are wobbly.
ネジが緩んでガクガクになった。
The screw came loose and it became wobbly.