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Noun: substituting  'súb-sti,t(y)oo-ting
  1. Working as a substitute for someone who is ill or on leave of absence
    - subbing
Verb: substitute  'súb-sti,t(y)oot
  1. Put in the place of another; switch seemingly equivalent items
    "substitute regular milk with fat-free milk";
    - replace, interchange, exchange, sub
     
  2. Be a substitute
    "The skim milk substitutes for cream--we are on a strict diet"; "The young teacher had to substitute for the sick colleague";
    - sub, stand in, fill in
     
  3. Act or speak as a replacement (for someone or something)
    - deputize, deputise [Brit], step in, sub

Type of: alter, change, exchange, interchange, modify, replace, supercede [non-standard], supersede, supervene upon, supplant, work

Encyclopedia: Substitute