にゆれる

sway in; be swayed by

→ に
phrase Rare #39,211
sway in; be swayed by 揺れる means “to sway” or “to shake”; に marks what something sways in or is affected by. The example uses the hiragana spelling ゆれる.
JA: 赤と白の旗が風にゆれる。
EN: The red and white flags sway in the wind.