koruncasız, çaresiz, tehlikeye maruz, biçare, desteksiz, yapayalnız.
leave someone out on a limb: birisini tehlikeye maruz bırakmak.
be/go out on a limb: tehlikeye maruz kalma, çaresiz/desteksiz kalmak.
The producer of the play was left out on a limb when his backers suddenly withdraw their support.