WordNet sense 1 (a V shape):

peak, point

WordNet sense 2 (a relatively small amount of money given for services rendered (as by a waiter)):

baksheesh, gratuity, pourboire, backsheesh, bakshis, bakshish

WordNet sense 3 (the top point of a mountain or hill):

crest, crown, summit, top

WordNet sense 4 (an indication of potential opportunity):

hint, lead, steer, wind, wind, lead, lead, confidential information

WordNet sense 5 (give a tip or gratuity to in return for a service, beyond the compensation agreed on):

bung, fee

WordNet sense 6 (cause to topple or tumble by pushing):

topple, tumble

WordNet sense 7 (to incline or bend from a vertical position):

angle, lean, slant, tilt

WordNet sense 8 (walk on one's toes):

tiptoe, tippytoe

WordNet sense 9 (strike lightly):

tap

WordNet sense 10 (give insider information or advise to):

tip off