Put on your coat or you will catch your death.
catch one's death
idiomTo contract a serious illness, especially a nasty cold or other respiratory ailment and especially as a result of exposure to wet or chilly weather.
If you walk home in this freezing rain without an umbrella, you are going to catch your death.
The elderly man ignored his daughter's pleas to stay indoors, insisting that he would not catch his death simply by walking in the autumn mist.
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abound in one's own sense
To follow one’s own inclinations and opinions.
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ace up one's sleeve
A surprise advantage of which others are not aware.
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act one's age
To behave in a manner appropriate to one's age.
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act one's age, not one's shoe size
Synonym of act one's age (“to behave in a mature manner; to avoid being childish”).
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afraid of one's own shadow
Exceptionally timid.
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air one's dirty laundry in public
To reveal one's sordid secrets to the public.
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air one's dirty linen in public
Synonym of air one's dirty laundry in public.
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albatross around one's neck
A characteristic, possession, associate, or previous deed that hinders one's ability to succeed.