A long heavy hammer, often wielded with both hands, used for driving wedges and posts and for other heavy work.
To strike with or as if with a sledgehammer.
Ruthlessly severe; crushing: sledgehammer prosecutorial tactics.
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.