Something that is very expensive.
Что-то, что очень дорого. (Chto-to, chto ochen' dorogo.)
"That new phone costs an arm and a leg, but it’s worth it."
"Этот новый телефон стоит целое состояние, но он того стоит." (Etot novyy telefon stoit **tseloe sostoyanie**, no on togo stoit.)
to stop thinking about something for a while and relax
to reduce spending; to save money due to financial constrain...
in a risky or dangerous situation
to prepare energetically for something
an unpredictable person who may cause problems
to allow natural processes to happen without interference