To stretch one's neck and stand on tiptoes in eager anticipation or longing; to look forward to something with keen desire.
听闻这位著名艺术家的画展即将开幕，许多艺术爱好者都延颈跂踵，期盼着能一睹真迹。
Hearing that the famous artist's exhibition was about to open, many art enthusiasts stretched their necks and stood on tiptoes, eagerly anticipating the chance to see the original works.
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