老司機 [－－机]

Jyutping lou5 si1 gei1
Pinyin lǎo sī jī

Definitions (Wiktionary)
  1. noun, Mainland-China, neologism, slang
    old hand; veteran; insider
  2. noun
    Used other than figuratively or idiomatically: see 老 (lǎo), 司機／司机 (sījī): experienced vehicle driver

老司機 [－－机]

Jyutping
Pinyin lǎo sī jī

Definitions (CC-CEDICT)
  1. (coll.) an old hand at sth