To breathe: "And from that one intake of fire/All creatures still warmly suspire"(Robert Frost).
To sigh.
[Middle English suspiren, to sigh, from Old French, from Latin suspīrāre : sub-, from below; see sub- + spīrāre, to breathe.] sus'pi·ra'tion (sŭs'pə-rā'shən) n.