Brown-noser / suck-up
Aquele estagiário é o maior paga pau do chefe.
That intern is the biggest brown-noser to the boss.
Paga pau labels a fawning suck-up, someone who flatters to win favour. It comes from the verb phrase pagar pau, "to pay homage to" or gush over someone; pau is a catch-all, slightly vulgar Brazilian word (literally "stick," also slang for money and for the male member), which gives the term its crude edge.
Falando's Idiom Trainer teaches you to recognize idiom meanings and create sentences using them, so you can speak like a Brazilian.
