Meaning: Increasing in strength or intensity
* The sun's heat was waxing as the day wore on.
* The politician's popularity was waxing as the election drew closer.
* The wind was waxing stronger, whipping up the waves.
Meaning: Covering with wax
* She went to the salon for a waxing appointment.
* He was waxing the car in the driveway.
* The furniture was waxed to a high shine.
Meaning: Becoming full (referring to the moon)
* The moon is waxing gibbous tonight.
* The night was dark, with only the waxing moon providing a sliver of light.
Let me know if you'd like more examples!