*legwh-

The core idea of this root was:

light in weight, not heavy

It’s the origin of English light (as in “not heavy”, not the shining light) and lung and bunch of words based on the Latin *levare, which was about raising.

Some English relatives:

• light (not heavy)
• lung (the light one)
• lever, leverage (raises, makes light)
• levee (the raised one)
• relief, relieve, relevance (lightening up, raising)
• elevate, elevator (raising)
• alleviate (raising, lightening up)