A small, round shield either carried or worn on the arm.
A means of protection; a defense: "has enjoyed a reputation as a shield and buckler for . . . the academic avant-garde” ( Donal Henahan).
To shield; protect.
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.