在线

Traditional form:

在線

Pinyin (reading):

zàixiàn

Definitions:

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

Characters:

• 在 - at, in, on; to exist; used to indicate the present progressive tense
• 线 - line, thread, wire; clue, trail

Traditional characters:

• 在 - at, in, on; to exist; used to indicate the present progressive tense
• 線 - line, thread, wire; clue, trail