важничать

assume airs; give oneself airs; swagger; peacock; prance; swell; puff; bridle up; put on airs and graces; put on frills; put on side; cock one's nose; set up one's comb; act the lord; flaunt; be puffed up; chuck weight about; get too big for shoes; grow too big for one's shoes; go about with head in the air; play the peacock; put oneself forward; set oneself forward; talk big; talk large; talk tall; blow up; bridle; condescend; get the high-hat; get the highhat; hold head high; walk heavy; assert oneself; assume air; be on the high horse; ride the high horse; feel oats; take on; inflate; lug; put on airs; swash; god it; lord; cock; be on one's high horse; lord it; be puffed up; be too big for one's boots; throw one's weight around (Our boss has been throwing his weight around ever since he got his promotion Taras); give one's self airs; carry it high; be cock on the hoop; go high in the instep; jeat; jet; nose; prink; roister; show off; take state upon one; strut; take airs; act important; tittup ([prob. echoic of hoofbeats] to move in a frolicsome or prancing way; caper)

Игорь Миг

act like a bigshot; act superior; act high and mighty

amer.

ride one's high horse; mount the high horse; cut a gash; cut a swath; showboat; plume oneself

austral., slang

swank

fig.

sit cock horse; plume; be on one's tight ropes; puff up (The new girl seems rather puffed up, as if she thinks she's too important to talk to anybody – Новая девица, кажется, излишне чванится, думает, что она такая важная, что никто не достоин с ней и говорить. Taras)

idiom.