Definitions in relation to their use in these kangaroo words, taken from Google Dictionary, and edited for formatting.
Kangaroo word: resigned
Joey word: reigned
resigned (verb): give up an office, power, privilege, etc.
reigned (verb): be the best or most important in a particular area or domain.
The letters R, E, I, G, N, E, and D found within the anti-kangaroo word “resigned” arrange in the listed order to complete the joey word “reigned”. While a word can have multiple definitions, in relation to their use with kangaroo words, these two words share an opposite meaning: leave power vs. hold power.