fill in
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1.
Complete something, especially by supplying more information or detail. For example, Be sure to fill in your salary history. It is also put as
fill in the blanks, as in We'll rely on Mary to fill in the blanks. Yet another related usage is
fill someone in, as in I couldn't attend, so will you fill me in? The first term dates from the mid-1800s; the others from the first half of the
1900s. Also see
fill out.
2.
Also,
fill in for. Take someone's place, substitute for. For example, The understudy had to fill in at the last minute, or I can't come but my wife will fill in for me. Also see fill someone's shoes.
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Copyrights:
American Heritage Dictionary of Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Company. All rights reserved.
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