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To go about bunglingly, awkwardly, mindlessly, etc., during some task or in general. There are so many problems in the world, but people would rather bumble through than do anything to help change them. You got a D because you just bumbled through this paper without making any meaningful analysis of the text.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
bumble through something
to get through something clumsily. I guess I will have to bumble through this speech again. Lily bumbled through her song and fled from the stage.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.