To thrash; beat.
To defeat decisively.
To censure something or someone forcefully: "I was out to trounce on every digression and indiscretion conducted (or should I say semiconducted) in this performance” ( Robert Maxwell Stern).
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.