Present participle of flichter; the ongoing action of moving with quick, unsteady, trembling motions.
From flichter with the present participle suffix -ing, indicating a continuous or habitual action in the present tense or as a gerund.
The -ing form transforms a momentary motion into an extended state of being—'flichtering' suggests something perpetually restless, like the constant agitation of nervous energy that can't settle.
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