펄럭이다

keep waving; keep flapping; keep fluttering

Explanation

[펄러기다]

keep waving; keep flapping; keep fluttering
For a wide and big cloth, etc., to keep swaying fast and strongly in the wind, or to make this happen.

Examples
깃발이 펄럭이다
옷자락이 펄럭이다
책장을 펄럭이다

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