Definitions in relation to their use in these kangaroo words, taken from Google Dictionary, and edited for formatting.
Kangaroo word: threat
Joey word: treat
threat (noun): a statement of an intention to inflict pain, injury, damage, or other hostile action on someone in retribution for something done or not done.
treat (noun): an event or item that is out of the ordinary and gives great pleasure.
The letters T, R, E, A, and T found within the anti-kangaroo word “threat” arrange in the listed order to complete the joey word “treat”. While a word can have multiple definitions, in relation to their use with kangaroo words, these two words share an opposite meaning: menace vs. gift.