在線

在线
zàixiàn
  1. online; connected to the Internet
  2. (fig.) (coll.) (of a person) mentally focused; engaged; (of skills, performance etc) sharp; on point; functioning at a high level

CEDICT

colloquial

Entry Composition

1 在 zài
  1. to exist; to be alive
  2. (of sb or sth) to be (located) at
  3. (used before a verb to indicate an action in progress)
2 線 xiàn
  1. thread
  2. string
  3. wire
  4. line
  5. (after a number) tier (unofficial ranking of a Chinese city)

classifiers: 條, 股, 根