onion
/ˈʌnɪən; `ʌnjən/ n
1
(a) [C] type of vegetable plant with a round bulb that has a strong smell and flavour, used in cooking 洋葱; 葱头: Spanish onions 西班牙葱
a crop of onions 洋葱的收获
spring onions 春葱.
(b) [C, U] this plant as food 洋葱, 葱头（食物）
chop onions to make a sauce 剁洋葱作沙司
too much onion in the salad 色拉中洋葱太多
[attrib 作定语]
French onion soup 法式洋葱汤.
2 (idm 习语) know one's onions/stuff => know.