現學現賣

现学现卖
xiànxuéxiànmài

immediately wielding new knowledge

Wiktionary

Entry Composition

1 現 xiàn
  1. to appear
  2. present
  3. now
  4. existing
  5. current
2 學 xué
  1. to learn
  2. to study
  3. to imitate
  4. science
  5. -ology
3 現 xiàn
  1. to appear
  2. present
  3. now
  4. existing
  5. current
4 賣 mài
  1. to sell
  2. to betray
  3. to spare no effort
  4. to show off or flaunt