noun
lifeline; indispensable thing
Figurative use: something essential for survival, success, or well-being. Often used in phrases like 生命線を握る (hold the lifeline) or 生命線を断つ (cut off the lifeline).
この道路は被災地にとっての生命線だ。
This road is a lifeline for the disaster-stricken area.
彼は会社の生命線
He holds the company's lifeline.
noun
life line (palm reading)
The line on the palm used in palmistry to indicate vitality and life span. Often discussed in fortune-telling contexts.
手相占いでは、生命線が長いと長生きすると言われる。
In palm reading, a long life line is said to indicate a long life.