substituting
verb (present participle)UK /ˈsʌbstɪtjuːtɪŋ/
US /ˈsʌbstɪtuːtɪŋ/
Using one thing in place of another.
She is substituting honey for sugar in the recipe.
RELATED WORDS
OTHER MEANINGS
2. Putting a player in place of another player during a game.
The coach is substituting a fresh player for the tired one.
3. Doing someone's job or duty for them for a while.
He is substituting for the regular teacher today.
4. Using a symbol or letter in place of another in math or writing.
The puzzle is substituting numbers for letters.