flare out
to spread out; to widen. (Said especially of one opening of a tube or round-topped vessel.) The end of the pipe flared out to a larger diameter. The top of the vase flared out, and was decorated with little blobs of colored glass.
flare something out
to spread something out; to make something wider. (Said especially of one end of a tube or round-topped vessel.) Can you flare the end of this pipe out a little? Flare out the end of this pipe.
flare up
1. Lit. [for something] to ignite and burn. The firewood flared up at last—four matches having been used.
2. Lit. [for a fire] to burn brightly again and expand rapidly. After burning quietly for a while, the fire suddenly flared up and made the room very bright.
3. Fig. [for a pain or medical condition] to get worse suddenly. My arthritis flares up during the damp weather.
4. Fig. [for a dispute] to break out or escalate into a battle. A war flared up in the Middle East. We can't send the whole army every time a dispute flares up.
5. and flare up at someone or something Fig. to lose one's temper at someone or something. I could tell by the way he flared up at me that he was not happy with what I had done. I didn't mean to flare up.