Is the colorful flag fluttering in the wind a four-character idiom?

"Colorful flags facing the wind" is not a four-word idiom. There are only three four-character idioms with "windward":

1, waiting for the moon in the wind

Pinyin: yíNGFüngdàiyuè

Explanation: refers to a secret date between a man and a woman.

Source: Tang Yuanzhen's Biography of Yingying: "The West Chamber under the Moon, the windward door is half open, and the flowers on the wall are shaking, which is suspected to be a jade man."

For example, making sentences: it is obviously waiting for the Pudong tiger in the wind, stealing poems between two times. ★ Meng Mingcheng Shun's "Jimmy Yue in Jiao Hong"

Pinyin code: yfdy

Usage: as predicate and attribute; Refers to a secret date between a man and a woman

2. Snow in the wind

Pinyin: yíNGFüngàoxu

English: Yes, I am. Against the cold wind and heavy snow. Often describe the journey as hard.

Source: Wu Ming Chengen's Journey to the West: The 44th time: "It's really romantic, wearing a moon and wearing a star, traveling on Wan Li Road, it's early spring weather, but seeing the transshipment of three yang, everything shines."

Pinyin code: yfmx

Usage: as object and adverbial; Used to do things

3. Flying in the wind

Pinyin: yí ngf ē ngzhā ozhn

Explanation: fluttering: fluttering, shaking. Describe the flag flying in the wind.

Source: Guo Moruo's Impression of Hong Nanjing: "The red flag flutters in the wind and seems to be visible within a radius of at least one kilometer nearby."

Red flags fluttering in the wind are everywhere in the square.

Pinyin code: yfzz

Synonym: fluttering in the wind, fluttering in the wind

Antonym: die slowly.

Usage: as predicate and attribute; Description mark, etc.