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up and at 'em

up and at 'em idiom

Get going, get busy, as in Up and at 'em—there's a lot of work to be done. This colloquial idiom, often uttered as a command, uses at 'em (for “at them”) in the general sense of tackling a project, and not in reference to specific persons.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.