picar.

to itch (to feel itchy; to feel a need to be scratched)

una tela que pica

to sting

to chop

picar cebollas

to bite

to mince, to dice

to stab; to wound

to snack; to nibble; to have a bite

me apetece picar algo

to rot; to decay; to eat away; to rust

to pique

to crush (ice)

to sting or be pungent to the lips or tongue, be spicy or, of a candy, very sour

Este chile pica mucho.

to sexually penetrate, fuck

to get angry, get annoyed, take offence

to turn sour

to get addicted, fascinated, enraptured

to bounce

to click (such as with a computer mouse)

to knock (on a door)

to steal, rob

Aprovecha y pícate algo, socio.

to wink (blink with only one eye as a message, signal, or suggestion)