Used other than as an idiom: Having large bones.(adjective)
Fat, obese.(adjective)
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Use "big-boned" in a sentence
"First Impression: Hedda is described as a big-boned woman who is stern and stubborn."
"Detective Thelma Fielding, probably forty, was a strong woman with exceptionally large eyes, man-hands, what you’d call a big-boned woman."
"With a larger-than-life aura, this short, big-boned Jewish woman had sinewy, arthritic hands, rounded shoulders, and burning bunions on her tired feet."