1. (v. i.) To inhale a larger quantity of air than usual, and immediately expel it; to make a deep single audible respiration, especially as the result or involuntary expression of fatigue, exhaustion, grief, sorrow, or the like.

2. (v. i.) Hence, to lament; to grieve.

3. (v. i.) To make a sound like sighing.

4. (v. t.) To exhale (the breath) in sighs.

5. (v. t.) To utter sighs over; to lament or mourn over.

6. (v. t.) To express by sighs; to utter in or with sighs.

7. (n.) A deep and prolonged audible inspiration or respiration of air, as when fatigued or grieved; the act of sighing.

8. (v. i.) Figuratively, a manifestation of grief; a lament.