повернись - повернитесь - повернуться
ложись - ложитесь - ложиться
оглянись - оглянитесь - оглянуться
успокойся - успокойтесь - успокоиться
уймись - уймитесь - ?
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Sign up to join this communityIt's "уняться". Well, usually the answer supposed to be somewhat wider, but in this particular case that's virtually all that can be said)
UPD: To make this answer slightly more informative, here's what worth to me mentioned. There's a bunch of verbs in Russian - понять
, занять
, нанять
, унять
etc. that have form with -йм: пойми
, займи
, найми
, уйми
.
Historically this is because нять
is derived from Proto-Slavic jęti
, which also reconstructed in form *jьmǫ
.
Curious relevant fact: понять
and поймать
are actually related.