To lose part of something, resulting in an incomplete or imperfect state, such as a physical object that is no longer whole or a situation lacking necessary qualities.

To gradually decrease in size or fullness, often used in reference to the phases of the moon moving from full to crescent.

To be deficient in certain qualities or characteristics that are expected or required, indicating a lack or absence of an important element.

To have an element or aspect missing that disrupts wholeness or functionality, emphasizing the importance of completeness in both physical and metaphorical contexts.