double as +
兼任 (某職位或某角色)
The actor doubled as the father in the play. (這位演員在劇中兼演父親的角色)
double (up) as +
也可用作，兼作
The kitchen table doubles as my desk when I’m doing my homework. (我在做家庭作業時，這個餐桌還可以當書桌用)
My study doubles up as a spare bedroom when we have visitors. (我們有訪客時，我的書房也兼作備用的臥房)
double back
原路折返 (尤指始料未及者)
When he saw the police, he had to double back. (當他看到警察時，他不得不原路折返)
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