godan -いく／-ゆく verb (spec.) / intransitive verb:

• to go; to move (in a direction or towards a specific location); to head (towards); to be transported (towards); to reach ➜ 来る【くる】
• to proceed; to take place - い sometimes omitted in auxiliary use ➜ 旨く行く
• to pass through; to come and go
• to walk
• to die; to pass away ［逝く］
• to do (in a specific way)
• to stream; to flow

auxiliary verb:

• to continue

godan -いく／-ゆく verb (spec.) / intransitive verb:

• to have an orgasm; to come; to cum - usually written using kana alone
• to trip; to get high; to have a drug-induced hallucination - usually written using kana alone - slang