To mislead, to try to make someone believe a lie.(verb)
To encourage with the illusion of a romantic relationship.(verb)
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Use "lead on" in a sentence
"But Kübler-Ross had a lead on Bowlby and Parkes out of the gate: she had already published On Death and Dying by the time Bowlby and Parkes introduced their four phases of grief in 1970."
"Gonzalez de Galdeano still wore the yellow jersey, but had just a twenty-six-second lead on Lance."
"I cried out as I felt myself falling, too fast to right myself, and by the time my elbows hit the leaf-coated ground, she had gotten a huge lead on me."