1 [intransitive and transitive]HBP
if vegetables, seeds, or plants sprout, they start to grow, producing shoots, buds, or leaves:
Move the pots outside when the seeds begin to sprout.
Trees were starting to sprout new leaves.
2 [intransitive] also sprout up
to appear suddenly in large numbers:
Office blocks are sprouting up everywhere.
3 [intransitive and transitive]
if something such as hair sprouts or if you sprout it, it starts to grow:
Jim seemed to have sprouted a beard.