俗語說：“在家靠父母，出門靠朋友。”朋友在每個人的一生中都扮演著重要的角色，不過具體是什么角色還要看朋友的屬性來分，有些是bosom friend(知己)，福禍與共;有些是acquaintance(泛泛之交)，點頭就過;還有一些則是frenemy(友敵)，笑臉相迎，背后暗戰(zhàn)。

"Frenemy" (alternately spelled "frienemy") is a portmanteau of "friend" and "enemy" which can refer to either an enemy disguised as a friend or to a partner who is simultaneously a competitor. The term is used to describe personal, geopolitical, and commercial relationships both among individuals and groups or institutions. The word has appeared in print as early as 1953.

友敵(frenemy，有時也拼做frienemy)，是friend(朋友)和enemy(敵人)兩個詞組合而成的，指偽裝成朋友的敵人或者互相競爭的同伴。這個詞1953年就已經出現，用來指代個人及群體組織之間的人際關系、地緣政治關系以及商業(yè)關系。

For example:

Zack is John's frenemy. They get along in the office but both of them work on internal competing teams.

扎克和約翰是友敵。他們在辦公室相處得不錯，同時又在團隊內部相互競爭。