Under attaching / letting go you can literally think of attaching / detaching to something or someone. But also by taking something, for example drink, food or something that you experience and cannot digest.

In addition, you can also think figuratively of something that you get to digest.

What lump is forced on you. Who soiled you.

Letting go can also be seen in this way, so how does something leave your body.

What you can't swallow, do you need or can't get rid of.

Who or what weighs on you.

Who or what should you digest, leave.