Webster's Revised Unabridged Dictionary · 1913

Behavior

Behavior ({not transcribed}) , noun

Manner of behaving, whether good or bad; mode of conducting one's self; conduct; deportment; carriage; -- used also of inanimate objects; as, the behavior of a ship in a storm; the behavior of the magnetic needle.
A gentleman that is very singular in his behavior. — Steele
Collocations (2)
To be upon one's good behavior or To be put upon one's good behavior , to be in a state of trial, in which something important depends on propriety of conduct.
During good behavior , while (or so long as) one conducts one's self with integrity and fidelity or with propriety.