noun
shaking; swaying; unsteadiness
Refers to physical instability or wavering, often used in contexts like an unsteady foundation or a trembling object. Can also appear in metaphorical expressions about resolve or beliefs.
地震で建物に揺るぎが生じた。
The earthquake caused the building to shake.
彼の決意には少しの揺るぎもなかった。
There was not the slightest wavering in his determination.
揺れる is the intransitive verb meaning 'to shake' or 'to sway', while 揺るぎ is the noun form referring to the state or instance of shaking.
動揺 often implies emotional disturbance or agitation, whereas 揺るぎ focuses more on physical or metaphorical instability.
Derived from the verb 揺るぐ (yurugu, 'to shake, to waver'), which is of native Japanese origin. The noun form 揺るぎ represents the continuative stem (連用形) of the verb.