lain back

Verb

lie back (third-person singular simple present lies back, present participle lying back, simple past lay back, past participle lain back)

1. (intransitive) To lie down by moving in a posterior direction, ending up supine.
   • The imaging technician told him to lie back and then remain still for a minute.

   Synonyms:

   supinate, resupinate

2. To relax, to exert less effort.
   • You can predict that he's going to lie back and take it easy if you let him find out that there's no pressing deadline from the customer on this job.