There's a squat little pomegranate tree in the courtyard.
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grammar
ABB-style descriptive adjective: 矮 (short) + reduplicated 墩 (a stout stump/block). The doubled syllable adds vivid, slightly cute color - typical of spoken Mandarin. Other ABB adjectives in this family: 胖乎乎 (plump), 圆滚滚 (roly-poly).