How to use at someone's disposal in a sentence. What does is at disposal expression mean? is at disposal phrase. Disposal definition, an act or instance of disposing; arrangement: the disposal of the troops. At someone's disposal definition is - available for someone to use : available for whatever one needs. See more. Definitions by the largest Idiom Dictionary. disposal meaning: 1. the act of getting rid of something, especially by throwing it away: 2. available to be used by…. Learn more. Definition of is at disposal in the Idioms Dictionary.