bumble through
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. If you want get into a good college, you can't just bumble through high school. You need to start making an effort!
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