He turned his coat and joined the rival political party.
turn one's coat
idiomTo turn against a previous affiliation or allegiance.
Origin
disputed originFrom the practice of turning one's uniform coat inside out in order to hide the colors reflecting one's allegiance.
After years of supporting the company, the manager turned his coat to work for their biggest competitor.
The senator was accused of turning his coat when he abandoned his long-held principles to secure a position in the new administration.
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abound in one's own sense
To follow one’s own inclinations and opinions.
- 02
ace up one's sleeve
A surprise advantage of which others are not aware.
- 03
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”).
- 05
afraid of one's own shadow
Exceptionally timid.
- 06
air one's dirty laundry in public
To reveal one's sordid secrets to the public.
- 07
air one's dirty linen in public
Synonym of air one's dirty laundry in public.
- 08
albatross around one's neck
A characteristic, possession, associate, or previous deed that hinders one's ability to succeed.