глаг.

let smb. go whistle (кого-л.); fluff off (кого-либо); give the fluff (кого-либо); tell somebody where to get off (Anglophile); give the brush-off (Anglophile); stall off (Anglophile); rebuff (кого-либо DC); turn down (Dollie)

Игорь Миг

fend off

амер.

blow someone off (Taras); tell someone to get lost also good with "in no uncertain terms" (отшить кого либо Maggie)

Макаров.

give someone the fluff (кого-либо); give someone the brush-off (кого-либо)

Макаров., разг.

let someone go whistle (кого-либо)

разг.

brush the whole matter off (кого-либо); blow off (кого-либо; give the cold shoulder to someone • She's going to blow off John because she's not interested in him. 4uzhoj); brush off (кого-либо); shoot down (shoot someoned down, в отношениях полов Баян); give a cold shoulder (TaylorZodi); dismiss (Asterite); reject (отвергнуть ухаживания April May); tell sbd to take a hike (кого-либо Баян); finish sewing

сл.

send someone packing (VLZ_58); reject romantic advances (VLZ_58); dump (Abysslooker)

Gruzovik, разг.