To briefly remove or tap one's hat as a gesture of greeting, deference, or respect. / (idiomatic) To acknowledge or show respect; to honor.

A pen that holds quick-drying ink conveyed to a writing surface by means of a felt nib.

plural of felt-tip pen

(Britain, idiomatic, vulgar) Tumbling or falling; upside-down.

plural of tip wage credit

(slang, archaic) To fail in one's plan or attempt.

(euphemistic) To give oral sex to someone (female).

Zegris eupheme, a species of orange tip butterfly.

plural of life pro tip

A good piece of advice that can be immediately applied in daily life.