the soul of discretion

Someone who can be trusted to keep information private. Don't worry, my sister is the soul of discretion—she won't tell anyone about our engagement before we do.

See also: discretion, of, soul

See also:

a living soul
engage (someone) to (someone)
engage to
have a loose tongue
drop the pilot
goombah
breathe (up)on (someone or something)
breathe on
desert (someone or something) to (someone or something)
desert to

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