1) Aline 2) Flaring 3) Increasing 1) Burst into flame 2) Curved outward 3) Flaring 4) Got redder 5) Increasing 6) Intensified 7) Like bell-bottoms 8) Like loose skirts 9) Like some slacks 10) Like the bell of a trumpet 11) Spread out 12) Spread outward 13) Wider at one end 
• (imp. & p. p.) of Flare
[adj] - having a gradual increase in width
A difficult to jam crack because the sides open up outwards.
flaring adjective having a gradual increase in width; `flared nostrils`; `a skirt flaring from the waist`
Describes a crack with nonparallel sides that diverge upward or inward.