Definitions
1.Verbpresent participle and gerund of upstage
2.NounA situation where somebody or something is upstaged; thus:
A stealing of the spotlight, as (or as if) one performer eclipses another in the audience's attention.
An increase in the stage of a case of a disease (usually a cancer), from a less-threatening to a more-threatening stage.
3.NounA stealing of the spotlight, as (or as if) one performer eclipses another in the audience's attention.
4.NounAn increase in the stage of a case of a disease (usually a cancer), from a less-threatening to a more-threatening stage.