dummy:1

noun
dum*my \ ˈdə-mē \
1588{ds||1|a|}
  • a person who is incapable of speaking
  • a person who is habitually silent
  • a stupid person

dummy:2

adjective
dummy \
1839{ds||1|a|}
  • having the appearance of being real : artificial
  • existing in name only : fictitious
  • apparently acting for oneself while really acting for or at the direction of another

dummy:3

verb
dummy \
1912
  • to make a dummy of (something, such as a publication) —often used with up

dummy up

verb
dummy up \
1926
  • to say nothing : clam up

dummy variable

noun
dummy variable \
1934
  • an arbitrary mathematical symbol or variable that can be replaced by another without affecting the value of the expression in which it occurs

dummy pill

noun
dummy pill \
  • a pill or substance that is given to a patient like a drug but that has no physical effect on the patient : placebo

dummy run

noun
dummy run \
  • a practice event that is done to prepare for the actual event that will happen in the future : dry run

crash test dummy

noun
crash test dummy \
  • a life-size model of a person used in tests to see what happens to people when a car gets into an accident
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