He was criticized for having a double standard.

His speech was a double negative, making it difficult to understand.

He received training to handle a heavy machine gun.

Doublet is an important concept in linguistics.

He drew the heavy vine bow.

A diphthong refers to the phenomenon where two vowels are pronounced consecutively within a single syllable.

This house is warm even in winter because it has double-pane windows.

Let's cherish every encounter with the spirit of 'once in a lifetime'.

Life is a series of ups and downs.

He does his work perfectly, dotting the i's and crossing the t's.