a secret enemy
隠れた敵
"Be careful; there’s a snake in the grass."
"気をつけて；草の中に隠れた敵がいる。"
A detailed plan or strategy for achieving success.
not very intelligent
to express an opinion in a direct and straightforward way
to make someone jealous
in a difficult situation where any choice you make will have...
take advantage of a good situation while it lasts
