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Difference between By word of mouth and Mouth words

by word of mouth—hear about smth. from another person:

  • I can’t remember seeing it advertised much, so most people probably hear about it by word of mouth.

mouth words

1. form words silently with one’s lips:

  • Since the mansion was wired with microphones, Howard would mouth words silently when she wanted to have a private conversation.

2. speak in an indistinct way:

  • Patients treated in the intensive care unit communicate primarily through head nods and mouthing words.