What is the meaning of the word "tip"?

Definitions:

a relatively small amount of money given for services rendered, such as to a waiter or taxi driver noun
- I left a 15% tip on the restaurant bill.
an indication of potential opportunity noun
- I got a tip on the stock market.
cause to tilt verb
- tip the screen upward
give a tip or gratuity to in return for a service, beyond the compensation agreed on verb
- Remember to tip the waiter
give insider information or advise to verb
- I tipped off the police about the terrorist plot.
mark with a tip verb
- tip the arrow with the small stone
remove the tip from verb
- tip artichokes
usually relating to a mountain or hill, the top or extreme point of something noun
- The tip of Mount Everest is over 29,000 feet above sea level.