to participate in an enjoyable activity
принять участие в увлекательной деятельности (prinyat' uchastie v uvlekatel'noj deyatel'nosti)
"Even the shy guests joined in the fun after a while."
"Даже застенчивые гости вскоре присоединились к веселью." (Dazhe zastenchivye gosti **vskore prisoedinilis' k vesel'yu**.)
to do someone else’s job temporarily
to continue doing something; to have a good relationship
to take a short break or leave temporarily from work
to reduce the rate of economic expansion
to continue strongly by relying on a tool or support
to try hard to get something done or accepted