He always carries an umbrella around.

He was holding my hand tightly.

He is my best friend.

His goal was truly a miracle play.

His actions always have a duality.

These shoes have a double sole and are very durable.

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.

He was criticized for having a double standard.

Doublet is an important concept in linguistics.