at right angles (to something)HMif two things are at right angles, they make a 90° angle where they touch （与某物）成直角 Hold the brush at right angles to the surface. 刷子要和表面垂直。
at right angles (to something)• The aisles intersect at right angles to form the shape of a cross.
→ at right angles (to something) at right angle(1)