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Jyutping lou5 tit3
Pinyin lū tiě

Definitions (Wiktionary)
  1. verb, slang, verb-object
    to do weight training

擼鐵 [撸铁]

Jyutping
Pinyin lū tiě

Definitions (CC-CEDICT)
  1. (coll.) to pump iron
  2. to work out