You should do your homework before you buy a new car.
do one's homework
idiomTo prepare oneself with the relevant knowledge; to carry out the necessary research in advance.
If you want to succeed in this job interview, you need to do your homework on the company first.
The journalist spent weeks doing her homework, carefully reviewing every document before she finally published the investigative report.
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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.
- 04
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.