/flæɡ/
a piece of cloth with a distinctive design or symbol representing a country or organization旗，旗帜；
Kids waved flags to greet the teachers.孩子们挥舞着旗帜，欢迎老师们。
PS: (Word roots are not omnipotent, but understanding of word roots and initial word meanings + reinforcement in context = omnipotent)
flag /flæɡ/ n. 旗，旗帜；
Word root breakdown:
This word carries the same meaning as “fl” we previously discussed, representing the sound of flapping or fluttering. It is an onomatopoeic word root, imitating the swaying of a flag in the air.
Remember one meaning at a time, and memorize other meanings when you encounter it again. Rome wasn’t built in a day.
My knowledge is limited, please leave a message if there are any mistakes.
Note: The pictures are related to the word or phrase