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flank (flăngk)
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n.
1. The section of flesh on the body of a person or an animal between the last rib and the hip; the side.
2. A cut of meat from the flank of an animal.
3. A lateral part or side: the flank of a mountain.
4.
a. The right or left side of a military formation: an attack on both flanks.
b. The right or left side of a bastion.
tr.v. flanked, flank·ing, flanks
1. To protect or guard the flank of.
2. To menace or attack the flank of.
3. To be placed or situated at the flank or side of: Two stone lions flanked the entrance.
4. To put (something) on each side of: flanked the driveway with tall shrubs.

[Middle English, from Old English flanc, from Old French flanc, of Germanic origin.]

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
 

Indo-European & Semitic Roots Appendices

    Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:

    Indo-European Roots

    Semitic Roots

    The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.