1) a person who breaks into a house etc at night in order to steal (burglar)

2) happening very often or with only short breaks (continual)

3) (a device with) a thin wire which melts and breaks the circuit when the electric current is too strong (fuse)

4) a solid figure with a flat base and sides that are triangles or parallelograms; a solid of this form, made of glass, which breaks up white light into the colours of the rainbow (prism)