the.com/behave
To follow the rules you'd happily break the moment no one's watching.
means To act in a proper, controlled, socially acceptable way, especially when expected to.
from From the 1400s be- (thoroughly) plus have, meaning to have or hold oneself — behavior was literally how you held yourself together.
Reflexive rootsOnce meant to bear oneself, not obey orders.
BehaviorismSpawned a whole psychology obsessed with observable acts.
Children onlyAdults rarely told to behave, suspiciously.