accidentalgain
nounUK /ˌæksɪˈdɛntl ɡeɪn/
US /ˌæksɪˈdɛntl ɡeɪn/
A good thing you get by luck, not by trying.
Finding a shiny coin on the sidewalk was an accidental gain.
OTHER MEANINGS
2. A profit that happens by chance rather than planning.
The extra sales were an accidental gain from the new sign.
3. A benefit in science or business that comes from a mistake.
The sticky glue was an accidental gain from a failed experiment.
4. Something good you did not expect to get.
Her accidental gain was a free ticket to the show.