Definitions in relation to their use in these kangaroo words, taken from Google Dictionary, and edited for formatting.
Kangaroo word: pest
Joey word: pet
pest (noun): a destructive insect or other animal that attacks crops, food, livestock, etc.
pet (noun): a domestic or tamed animal kept for companionship or pleasure.
The letters P, E, and T found within the anti-kangaroo word “pest” arrange in the listed order to complete the joey word “pet”. While a word can have multiple definitions, in relation to their use with kangaroo words, these two words share an opposite meaning: annoying animal vs. domesticated animal.