If your windows are not airtight, moisture will seep in.

Water is seeping through.

The melted snowpack seeps down to fill mountainside indentations to form glacial lakes.

If you listen to a lot of music, it gradually seeps into your consciousness or your unconsciousness and comes out in your music.

Run from arrogance, do not allow it to seep into your mind or into your speech.

The cold seeped into her bones.

Ahhh! Feel that beer seep into every fiber of my being. Yep, nothing beats a cold one after work.

Water is seeping into my rubber boots.

The blood seeped through my pantleg, and everyone knew I was wounded.

Bird lime accumulates on the boughs, which also seep gum, resin, pitch etcetera.