stood up

Tennessee Williamsの戯曲 "a streetcar named desire" からの引用です。
BLANCHE[suddenly]:
Stanley, tell us a joke, tell us a funny story to make us all laugh. I don't know what's the matter, we're all so solemn. Is it because I've been stood up by my beau.
長くなるので上の台詞が出るまでのいきさつは引用できませんが、Mitchが来ることを期待していたBlanchですが、Mitchは来なかった状況での台詞なので、"stood up" は待ちぼうけの意味だと分かります。一応辞書で "stand up" の説明を見ます。
・Collins Dictionary: If a boyfriend or girlfriend stands you up, they fail to keep an arrangement to meet you.: We were to have had dinner together yesterday evening, but he stood me up.

・Macmillan Dictionary: to not come to meet someone who you have arranged to meet, especially someone who you are having or starting a sexual or romantic relationship with: Did she stand you up?