
Say something, speak, etc. under your breath
Low Volume
Speaking under your breath involves very low volume, making it hard for others to hear.

Frustrated, she read the question and muttered the answer under her breath.
Discreet Disapproval
Often implies discreet disagreement or disapproval without making it obvious to everyone.

During the meeting, he disagreed but only voiced it under his breath.
Personal Reminder
Can be used for self-reminders or self-motivation without intending others to hear.

She recited the steps of the procedure under her breath before starting.
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