gilysse If I want to say I want to keep a secret on something related to someone, should I say, keep "his" discretion or keep "my" discretion? Neither of these is idiomatic. You don't "keep discretion".
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gilysseIf I want to say I want to keep a secret on something related to someone, should I say, keep "his" discretion or keep "my" discretion?Neither of these is idiomatic. You don't "keep discretion". You say, "Be discreet!"