you'll catch your death

you'll catch your death

You'll get sick if you do what you're about to do (often, go outside without being properly dressed). A shortened version of "you'll catch your death of cold." You can't go out without a coat at this time of year, you'll catch your death!
See also: catch, death

you'll catch your death (of cold)

A warning issued (often hyperbolically) to one deemed vulnerable to becoming ill with the common cold. You'll catch your death of cold if you leave the house with wet hair—it's freezing outside! You'll catch your death in this weather if you don't put on a coat!
See also: catch, death
References in periodicals archive ?
Put your cardi back on, you'll catch your death from exploitation," boom those who hate it.
But while it was a balmy 23C in Miami yesterday, in London on Thursday night it was only 2C, so word of advice, Justin - your buff new look is impressive but put a shirt on or you'll catch your death.
One friend reflected that she and my father had "lived great lives", another more simply that "the world is less of a place", while a third recounted that when she visited my mother in the last fragile weeks of her life, Rene drifted out of sleep, opened her eyes and muttered: "You should be wearing a jumper, you'll catch your death of cold.
It just shows what your mum used to say about 'cover up or you'll catch your death of cold' is a load of rubbish
It maybe summer, but this is Yorkshire -and you'll catch your death of cold wandering about in that flimsy nightie.
John worked until late into the nights to finish his design - You'll Catch Your Death Out There.
Polly Hopkins: You'll catch your death going out like that
You'll catch your death of cold Your mother said it was ok I must be getting old.
You'll catch your death if you go out with wet hair
Wearing an A-line red number, the TV presenter needs to take a leaf out of Leona's book and wrap something around those collar bones - you'll catch your death girl