The Collaborative International Dictionary of English v.0.48:

Suspire \Sus*pire"\, n. [Cf. L. suspirium.]
   A long, deep breath; a sigh. [Obs.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Suspire \Sus*pire"\, v. i. [L. suspirare to breathe out, to
   sigh; sub under + spirare to breathe: cf. F. souspirer, OF.
   souspirer.]
   To fetch a long, deep breath; to sigh; to breathe. --Shak.
   [1913 Webster]

         Fireflies that suspire
         In short, soft lapses of transported flame. --Mrs.
                                                  Browning.
   [1913 Webster]

WordNet (r) 3.0 (2006):

suspire
    v 1: heave or utter a sigh; breathe deeply and heavily; "She
         sighed sadly" [syn: sigh, suspire]
    2: draw air into, and expel out of, the lungs; "I can breathe
       better when the air is clean"; "The patient is respiring"
       [syn: breathe, take a breath, respire, suspire]