揺曳 is read as ようえい (youei) and means flutter.
ようえい
youei
ゆるがす
to shake
ゆる
ゆらぐ
to waver
ゆるぐ
ゆれる
ゆらゆら
swaying
ゆさぶり
shaking
ゆさぶる
to put off a batter (by varying one's type of pitch)
ゆり
vibration
ゆらす
to rock
ゆらぎ
tremor
ゆする
to blackmail