The term 'walk heavily' can be defined by the crossword solutions FOOTSLOG (8 letters), POUND (5 letters), RAMBLE (6 letters), PLOD (4 letters), SLOG (4 letters), CLOMP (5 letters), CLUMP (5 letters), SAFES (5 letters), STAMP (5 letters), STOMP (5 letters), TRAMP (5 letters), TROMP (5 letters), and NAVIGATE (8 letters). These words all describe a type of walking that is heavier than a normal pace, often with a dragging or shuffling motion. FOOTSLOG, RAMBLE, PLOD, SLOG, CLOMP, CLUMP, STAMP, STOMP, TRAMP, and TROMP all refer to a slow, heavy walk, while POUND and SAFES suggest a more forceful, determined stride. NAVIGATE implies a more purposeful movement, as if one is navigating their way through a difficult terrain.