godan verb (-ru), intransitive verb
Casual, often implies flopping or sprawling down in a relaxed or careless way. More colloquial than 寝転がる.
See also: 寝転がる
疲れたから、ちょっとそこに寝っ転がっていい?
I'm tired, so can I just lie down here for a bit?
子供たちが芝生の上に寝っ転がって空を見ている。
The kids are lying on the grass looking at the sky.