Definitions in relation to their use in kangaroo words, taken from Google Dictionary, and edited for formatting.
Kangaroo word: scrub
Joey word: rub
scrub (verb): rub hard so as to clean them, typically with a brush and water.
rub (verb): move one’s hand or a cloth repeatedly back and forth on the surface of with firm pressure.
The letters R, U, and B found within the kangaroo word “scrub” arrange in the listed order to complete the joey word “rub”. While a word can have multiple definitions, in relation to their use with kangaroo words, these two words share a similar meaning: move an object across a surface firmly and repeatedly.