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Verb: fill in
  1. Supply with information on a specific topic
  2. (art) represent the effect of shade or shadow on
    - shade
  3. Be a substitute
    "The young teacher had to fill in for the sick colleague";
    - substitute, sub [informal], stand in
  4. Write all the required information onto a form
    "fill in this questionnaire, please!";
    - complete, fill out, make out
Noun: fill-in  'fil,in
  1. Someone who takes the place of another (as when things get dangerous or difficult)
    "we need extra employees for summer fill-ins";
    - stand-in, substitute, relief, reliever, backup, backup man

Derived forms: filling in, fills in, filled in, fill-ins

See also: fill up

Type of: change, compeer, draw, equal, exchange, inform, interchange, match, paint, peer

Encyclopedia: Fill-in