The word flare , which can function both as a noun or a verb, can be used in a number of ways.
A flare is a small device that produces bright flame. For eg: A ship can fire a distress flare to signal that it’s in danger.
A fire can flare and the flames can grow larger. For eg: The forest fire flared in the dark, moonless light.
Flaming
Violence or conflict can flare and go out of control.
If people’s temper flares , it means they are very angry.
If someone’s nostrils flare , causing their nostrils to widen, it means they are really angry too.
If your dress designer tells you that your dress will have a flare at the bottom, he/she means that it will spread outwards at the end to form a wide shape.
Now, having learned so many ways in which the word flare can be used, do not confuse it with the word flair which means a natural talent.