Picking a general from among the dwarves. (best of a bad lot — Chinese saying)
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Colloquial and a bit pejorative — 矬 lives in northern dialect. The character combines 矢 'arrow' (used in 短 too, signaling 'short') with 坐 phonetic. The famous saying 矬子里拔将军 'pick a general from the shorties' = best of a bad bunch.