watch for one's chance ; await an opportunity
看到机会来了，丹尼斯伺机而动。
Seeing his chance, Dennis moved in for the kill.
《柯林斯英汉双解大词典》
那只猫在墙上伺机捕捉鸟儿。
The cat was on the wall, watching for birds.
《牛津词典》
汤姆在聚会上围着那位姑娘献殷勤，伺机和她交谈。
Tom circled about the girl at the party, waiting for a chance to talk to her.
youdao
侦候可乘之机。清 薛福成 《议定滇缅界商务条约疏》：“彼知 中国 界址未定，漫无限制，仍可伺机进占。” 许地山 《女国士》：“撒米引鸡，伺机携取。”
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