
Lie down
Rest Context
Use 'lie down' to indicate resting in a horizontal position, not necessarily implying sleep.

I'm going to lie down on the couch for a few minutes to relax.
Not Sit Down
'Lie down' means completely horizontal; it's different from 'sit down', which is not fully reclined.

Don't just sit down, lie down if you're feeling dizzy.
Physical Comfort
The phrase often suggests seeking physical comfort or a break from activity.

After running the marathon, he could hardly wait to lie down.
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