The Portuguese word for to touch is
tocar

Portuguese Definition

tocar
1. v. (indtr, em, direct=1) to touch, to finger, to feel (tactually)
Toquei levemente (em) seu braço - I slighty touched his arm
2. v. (figurative) to start addressing (a particular subject or issue)
Já que você tocou nessa questão, vamos continuar - Since you began talking about that issue, let's continue
3. v. to play (a musical instrument)
Ela toca piano muito bem - She plays the piano very well
4. v. to sound, jingle, to honk, to ring (a bell, alarm, horn or similar object)
Toque a campainha! - Ring the bell!
Não deveríamos ter tocado o alarme. - We shouldn't have sounded the alarm.
5. v. (Brazil, informal) to kick out, to expulse
Alguém precisa tocá-lo daqui - Someone has to kick him out from here
6. v. (Brazil, informal, reflexive) to become aware; to realize or perceive something
Só me toquei depois. - I only realized it later.

toque
1. n-m. touch, tap
2. n-m. ring (of a phone)
3. n-m. ringtone (of a mobile phone)
4. n-m. stroke
5. n-m. (by extension) detail, touch (distinguishing feature or characteristic)
6. n-m. a small quantity
7. n-m. advice or warning
8. v. verb form of tocar