1.
A ~ line or surface points straight up, rather than being sloping or horizontal.
We made two slits for the eyes and a ~ line for the nose...
The sides of the loch are almost ~.
= vertical
ADJ: usu ADJ n
2.
If one thing is ~ to another, it is at an angle of 90 degrees to it. (FORMAL)
The left wing dipped until it was ~ to the ground.
ADJ: usu v-link ADJ to n