accumulate, big and long, hackneyed
套 centers on layering or piling up, which leads to the idea of something becoming long and drawn-out, and by extension, trite or overused from repetition.
套 is a phono-semantic compound: 大 (big) on top, and a lower component that historically relates to length or covering. The exact development of the lower part is uncertain, but the character likely expressed the idea of something large and extended.
The top 大 (big) sits over a long, stretched-out lower shape. Imagine piling big things one on top of another until the stack becomes long and hackneyed from overuse.
For トウ, picture a towering stack of accumulated items: tower -> トウ, and the big pile grows long and trite.
overcoat; greatcoat; cloak; wrap; mantle
conventional; commonplace; trite; hackneyed
conventional phrase; stock phrase; cliché
summer overcoat; light jacket
mantle eye
satellite cell (glial); amphicyte
mantle (of an invertebrate)
one's habitual practice; usual measure; old trick
conventional (stock) phrase; hackneyed expression; platitude; cliché
hackneyed expression
conventionalism; old style
clinging to old customs; adhering to old traditions
spring overcoat
stale; hackneyed; clichéd
mackintosh; macintosh; raincoat