'Substituting' definitions:

Definition of 'substituting'

From: WordNet
noun
Working as a substitute for someone who is ill or on leave of absence [syn: subbing, substituting]

Definition of 'Substituting'

From: GCIDE
  • Substitute \Sub"stit"ute\, v. t. [imp. & p. p. Substituted; p. pr. & vb. n. Substituting.] [See Substitute, n.] To put in the place of another person or thing; to exchange. [1913 Webster]
  • Some few verses are inserted or substituted in the room of others. --Congreve. [1913 Webster]