Calved

verb

1. To give birth to a calf
2. To assist in a cow's giving birth to a calf
3. To give birth to (a calf)
4. (especially of an ice shelf, a glacier, an ice sheet, or even an iceberg) to shed a large piece, e.g. an iceberg or a smaller block of ice (coming off an iceberg)

   "The glacier was starting to calve even as we watched."

5. (especially of an iceberg) to break off

   "The sea was dangerous because of icebergs calving off the nearby glacier."