Little Jimmy was staring at a dog in the park whilst the dog was licking himself in inappropriate parts and said to his dad, "I wish I could do that."
Jimmy"s dad looked down at Jimmy and said, "Maybe if you ask the dog nicely, he might let you!!"
- deteriorate. retrogression n. Retrogressive adj.
n. in retrospect when looking back. [from *retro-, *prospect]
n. Any of a group of rna viruses which form dna during the replication of their rna, and so transfer genetic material into the dna of host cells. [from the initial letters of reverse transcriptase + *virus]