Underbelly

['ʌndəbelɪ] or ['ʌndɚ'bɛli]

(noun.) the quality of being weak or unprotected; 'the soft underbelly of the Axis'- Winston Churchill.

(noun.) the soft belly or underside of an animal's body.

(noun.) lower side; 'the underbellies of clouds'.

艾德丽安錄入--From WordNet