fill in

supply with information on a specific topic

• “He filled me in on the latest developments”

destroy completely, as if down to the roots

• “the vestiges of political democracy were soon uprooted”
• “root out corruption”

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”

write all the required information onto a form

• “fill out this questionnaire, please!”
• “make out a form”

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”