spy-v; 2 Senses

Sense Number 1: catch sight of

Examples:
She spied her brother on the computer.
After he had travelled a little way, he spied a dog lying by the roadside.

Mappings:
VerbNet: sight-30.2
FrameNet: Perception_active
PropBank: spy.01
WordNet 3.0 Sense Numbers: 1, 3

Sense Number 2: secretly watch and collect information

Examples:
Hari admitted that she spied for the German Secret Service.
She spied through a crack.

Mappings:
VerbNet: sight-30.2
FrameNet: Perception_active
PropBank: spy.01
WordNet 3.0 Sense Numbers: 2, 4