the characterzh
休
亻
person
木
tree
a person against a tree
Rest, drawn as a one-frame cartoon: a person (亻) leaning on a tree (木). The Shuowen says it plainly — 从人依木, ‘a person resting on a tree’. They didn't define rest; they sketched it, and the sketch holds from the oracle bones down.
source · 休, a 會意 (compound-ideograph); Shuowen: 休，息止也，从人依木 — Wiktionary / 說文解字