to rise to or maintain a standing or upright position
(usu in negative contexts ) said of reasoning, evidence, etc: to bear close scrutiny
informal to fail to keep an appointment with (somebody)
stand up and be counted
to make one's views known
stand up for
to defend (a person or thing) against attack or criticism
stand up to
to withstand the damaging effects of (wear, damage, etc)
to confront (aggressors or aggression) boldly