be a trooper about

[azyousual]

Hello again. Could you help me?
What does it mean: be a trooper about something?
For example:
’She tended to be a trooper about pain.’

[Ouisch]

It's actually spelled "trouper" when used this way, and it means she grins and bears it, she takes it well, doesn't complain and make a big deal out of it.

[Delmobile]

I believe the origin is theatrical. Someone who is in a theatrical troupe knows the show must go on, no matter what.

[not a teacher]