Definition of the life of Rileyinformal + somewhat old-fashioned
- He's been living/leading the life of Riley.
: the quality that distinguishes a vital and functional being from a dead body
: a principle or force that is considered to underlie the distinctive quality of animate beings
: an organismic state characterized by capacity for metabolism (see metabolism 1), growth, reaction to stimuli, and reproduction
: of or relating to animate being
: using a living model
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