1. to store; to save up; to stock up on; to lay in stock; to set aside
春から秋の間に働いて食料を蓄える。They work from spring to autumn and store up food.
2. to accumulate (e.g. knowledge); to build up (e.g. experience); to develop (e.g. one's skills)
だが、彼には蓄えた経験と知識がある。But he has the experience and knowledge he has built up.
3. to grow (a beard, moustache, etc.); to wear