Answer: lifeline

AnswerCrossword Clue
LIFELINE

"50-50" or "phone a friend"

LIFELINE

Potential millionaire's aid?

LIFELINE

"Who Wants to Be a Millionaire" option

LIFELINE
One of a "Who Wants to Be a Millionaire" trio
LIFELINE
Safety device
LIFELINEShip's safety rope
LIFELINEMaritime route of great importance.
LIFELINEPalmistry feature.
LIFELINEImportant route.
LIFELINESafety rig.
LIFELINE"The ...," Homer painting
LIFELINEIt's in the palm of your hand
LIFELINEPalm feature
LIFELINEPalm reader's reading
LIFELINEDrowning person's need
LIFELINEAid on "Who Wants to Be a Millionaire"
LIFELINERope from a ship, say
LIFELINESea-rescue staple
LIFELINEPalm feature?
LIFELINESinking sailor's salvation