essential utilities; critical infrastructure
Refers to utilities and services essential for daily life, such as electricity, gas, water, and communications. Often used in disaster contexts.
The lifelines (utilities) were cut off due to the earthquake.
Restoration of essential utilities is expected to take several days.
lifeline; vital connection
A figurative or literal line that provides crucial support or rescue; can refer to a rope, a communication link, or an indispensable person or thing.
She is like a lifeline to me.
The rescue team threw us a lifeline.