To have something important or difficult to say but be unable to express it, often due to circumstances or personal constraints; to have a grievance or hidden trouble that cannot be voiced.
他心里有好多委屈，却又说不出口，真是哑子托梦，无人知晓其苦衷。
He had many grievances in his heart but couldn't express them, truly like a mute trying to convey a message in a dream, with no one knowing his troubles.
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