Noun fill in has 1 sense
  1. stand-in, substitute, relief, reliever, backup, backup man, fill-in - 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"
    --1 is a kind of peer, equal, match, compeer
    --1 has particulars:
     locum tenens, locum; double, stunt man, stunt woman; surrogate, alternate, replacement
    Derived form: verb fill in3
,Verb fill in has 4 senses
  1. fill in - supply with information on a specific topic; "He filled me in on the latest developments"
    --1 is one way to
    inform
    Sample sentence:
    Somebody ----s somebody
  2. shade, fill in - represent the effect of shade or shadow on
    --2 is a kind of draw; paint
    Sample sentence:
    Somebody ----s something
  3. substitute, sub, stand in, fill in - 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"
    --3 is one way to exchange, change, interchange
    Derived form: noun fill-in1
    Sample sentences:
    Somebody ----s
    Somebody ----s PP
  4. complete, fill out, fill in, make out - write all the required information onto a form; "fill out this questionnaire, please!"; "make out a form"
    Sample sentence:
    Somebody ----s something
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