What does 'lumber' mean in terms of movement?

To lumber means to move heavily or clumsily, often with a sense of sluggishness or a lack of coordinated grace. This term is commonly associated with the way large animals or people might move when they are carrying a lot of weight or if they are not particularly nimble. This definition captures the essence of the word's connotation of cumbersome movement, which may evoke images of something that is not light or agile.

The other choices represent different types of movement that contrast with this idea. Gliding swiftly suggests a smooth and fast motion, while moving gracefully connotes elegance and fluidity, neither of which aligns with the heavy, uncoordinated movement described by lumbering. Similarly, to bounce lightly implies a lively and buoyant action that also does not reflect the heaviness and clumsiness inherent in the term "lumber." Hence, the option indicating heavy or clumsy movement is the most accurate interpretation.