die back (botany)

To die by degrees from the tip backwards (dieˈback noun)

die down

1. To subside
2. (of plants) to die above ground, leaving only roots or rootstocks

die game

To keep up one's spirit to the last

die hard

1. To struggle hard against death, to be long in dying
2. To be difficult to suppress, eradicate, or persuade

die off

To die quickly or in large numbers

die out

To become extinct, to disappear

die the death (theatre slang)

To arouse no response from one's audience

never say die

Never give up

to die for (informal)

Highly desirable or alluring