寡头垄断

oligopoly

few / scant / widowed

oligarch

head / hair style / the top / end / beginning or end / a stub / remnant / chief / boss / side / aspect / first / leading / classifier for pigs or livestock / CL:個|个[ge4]

suffix for nouns

ridge between fields / row of crops / grave mound

to monopolize

to break / to snap / to cut off / to give up or abstain from sth / to judge / (usu. used in the negative) absolutely / definitely / decidedly