(archaic) One should take immediate advantage of an opportunity that may not be available later.

One cannot change one's nature, no matter how much time passes.

(idiomatic) A response to taunting proclaiming the speaker's indifference.

The chief executive of the municipal government of a city, borough, etc., formerly (historical) usually appointed as a caretaker by European royal courts but now usually appointed or elected locally.

A dressing made from vegetable oil, raw egg yolks, vinegar or lemon juice, and seasoning, used on salads, with french fries, in sandwiches etc. / Any cold dish with that dressing as an ingredient.

(transitive) To cover or season with mayonnaise.

A female mayor. / The wife of a (male) mayor. / A daughter or female friend of a male mayor chosen by him to hold the title mayoress.

(colloquial, now rare, dated) may not (negative auxiliary)

a flourishing Mesoamerican civilization that existed in and around Guatemala from the 3rd century to the 9th century.

The Yucatec Maya language. / Any of the other various Mayan languages, such as Quiché, Mam and Tzotzil.