To adulate or flatter somebody excessively, generally to obtain some personal benefit or favour.(verb)
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Use "suck up" in a sentence
"Andie Walsh—strong enough to spurn the advances of that smarmy and evil but oh-so-popular James Spader—would never have stooped to suck up to Victoria Gould, or even Ali Gertz."
"Juliet was inhaling her lasagna like one of those superpowerful vacuums you see on TV, the ones that can suck up nails."
"All those hoops I had jumped through for himand now, next semester, there was going to be some new headmaster to suck up to."