a pod or husk, e.g. the outer covering of a nut or of maize

the shell of an oyster or clam

(in pl) something of no value

not worth shucks

informal (in pl) used as an interjection to express disappointment, surprise, or self-deprecation

Shucks, it was nothing

to strip (something) of shucks

(often + off) to remove or dispose of (something) like a shuck

shuck off clothing

shuck off bad habits