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

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

A willow grouse, Lagopus lagopus.

(idiomatic) One whose views are easily and regularly changed by the persuasion or influence of others.

A particular country dance, in which a pair of dancers go down a set of dancers, alternately swinging each other and other dancers on the sides.

To dance the strip the willow.

(mineralogy) A monoclinic-prismatic light green mineral containing hydrogen, magnesium, nickel, oxygen, and silicon.

Someone who draws up a will.

Any of a group of aquatic plants of the Americas in the genus Justicia, with long willow-like leaves and spikes of small purplish flowers. / The flowering plant Decodon verticillatus.

will have (with have as auxiliary verb)