English expressions

Dwell on

Meaning:1. to obsessively think

or worry about something.  2.  to inhabit a particular place or surface.

Examples:

In his speech, he dwelt on the plight of the sick and the hungry.

I want to become a scientist and study the creatures that dwell upon other planets.

That type of animal dwells exclusively on land.

Go astray

Meaning: 1. to deviate from what is good or expected.   2. to become lost.

Examples:

I'm afraid your son has gone astray and gotten into a bit of trouble.

A: "It seems my coat has gone astray."
B: "Hmm, maybe someone picked it up by mistake."

My life goals just kind of went astray for a time in my twenties, but I've got back on track.