beef up

to make something stronger or more powerful
http://dlvr.it/RylPCy

step up

to increase the level or strength of something
http://dlvr.it/RygQdn

turn off

to stop a machine or an appliance from working by using a button or a switch
http://dlvr.it/RybRlp

turn into

to change from one thing into another
http://dlvr.it/RyWZk6

bring back (1)

to bring something with you when you return from somewhere
http://dlvr.it/RyRnmh

end up

If you end up being somewhere, or doing something, it's because of decisions you've made in the past.
http://dlvr.it/RyNvg2

die off

If a group of people, animals, or plants dies off, all of them die over a period of time and none are left.
http://dlvr.it/RyL576