saber

1 : to know
2 : to know how to, to be able to <sabe tocar el violín : she can play the violin>
3 : to learn, to find out
4 a saber : to wit, namely

1 : to know, to suppose
2 : to be informed <supimos del desastre : we heard about the disaster>
3 : to taste <esto no sabe bien : this doesn't taste right>
4 saber a : to taste like <sabe a naranja : it tastes like orange>

: to know <ese chiste no me lo sé : I don't know that joke>