Throw (one) a lifeline phrase
It can also be phrased as "throw a lifeline to (someone)".
To help someone when they are facing a problematic or dangerous situation
You've thrown us a lifeline and we really appreciate it.
My car broke on the way to work this morning. Jack threw me a lifeline when he gave me a lift.
I wish someone would throw a lifeline to me.
To help someone deal with something
The verb “throw” should be conjugated according to its tense.
A lifeline is a safety feature on a boat, a rope that either protects you from falling off or that you can throw to someone who's drowning. When sailors need to rescue a swimmer or a clumsy passenger, it helps to have a lifeline handy. And when you receive other kinds of vital support or help — a mobile phone, or a job recommendation, or a college scholarship, for example — you can also call them "lifelines". This figurative meaning has been around since the 19th century, while the "live-saving rope" definition is the earliest one, from about 1700.
If you fall for someone's trick the first time then they are at fault.
Are you going to mess with me again? Fool me once, shame on you; fool me twice, shame on me.