Noun

1. A silent person; a person who does not talk.
2. An unintelligent person.

   • Don't be such a dummy!

3. A figure of a person or animal used by a ventriloquist; a puppet.
4. Something constructed with the size and form of a human, to be used in place of a person.

   • To understand the effects of the accident, we dropped a dummy from the rooftop.

5. A deliberately nonfunctional device or tool used in place of a functional one.

   • The hammer and drill in the display are dummies.

6. A pacifier.

   • The baby wants her dummy.

7. The partner of the winning bidder, who shows his or her hand.
8. A bodily gesture meant to fool an opposing player in sport; feint.
9. A word serving only to make a construction grammatical.

   • The pronoun "it" in "It's a mystery why this happened" is a dummy.

10. An unused parameter or value.

    • If flag1 is false, the other parameters are dummies.

Synonyms

• (Something made to look like a person) mannequin, marionette
• (Something to calm a baby) pacifier , soother

Verb

1. To make a mock-up or prototype version of something, without some or all off its intended functionality.

   The carpenters dummied some props for the rehearsals.