A hat tip is an act of tipping or (especially in British English) doffing one's hat as a cultural expression of recognition, respect, gratitude, greeting, or simple salutation and acknowledgement between two persons.
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Famous quotes containing the words hat and/or tip:
“I saw a guide-post surmounted by a pair of moose horns.... They are sometimes used for ornamental hat-trees, together with deer’s horns, in front entries; but ... I trust that I shall have a better excuse for killing a moose than that I may hang my hat on his horns.”
—Henry David Thoreau (1817–1862)
“Lolita, light of my life, fire of my loins. My sin, my soul. Lo-lee-ta: the tip of the tongue taking a trip of three steps down the palate to tap, at three, on the teeth. Lo. Lee. Ta.”
—Vladimir Nabokov (1899–1977)