SUBSTITUTE

(noun) a person or thing that takes or can take the place of another
synonyms : replacement
(noun) someone who takes the place of another (as when things get dangerous or difficult)
"the star had a stand-in for dangerous scenes", "we need extra employees for summer fill-ins"
synonyms : backup , backup man , fill-in , relief , reliever , stand-in
(noun) an athlete who plays only when a starter on the team is replaced
synonyms : reserve , second-stringer
(verb) put in the place of another; switch seemingly equivalent items
"the con artist replaced the original with a fake Rembrandt", "substitute regular milk with fat-free milk", "synonyms can be interchanged without a changing the context's meaning"
synonyms : exchange , interchange , replace
(verb) be a substitute
"The young teacher had to substitute for the sick colleague", "The skim milk substitutes for cream--we are on a strict diet"
synonyms : fill in , stand in , sub
(verb) act as a substitute
"She stood in for the soprano who suffered from a cold"
synonyms : deputise , deputize , step in
(adj.) artificial and inferior
"ersatz coffee", "substitute coffee"
synonyms : ersatz
(adj.) serving or used in place of another
"an alternative plan"
synonyms : alternate , alternative
(adj.) capable of substituting in any of several positions on a team
"a utility infielder"
synonyms : utility

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