act up: misbehave (for people); not work
properly (for machines).
"The babysitter had a difficult time. The chil-
dren acted up all evening."
act like: behave in a way that's like.
"What's wrong with Bob? He's acting like an
add up: find the total.
"What's the total of those bills? Could you
add them up and see?"
back off: not follow a threat.
"Tom was ready to call the police when I told
him I'd wrecked his car, but he backed off
when I said I'd pay for the damages."
back up (1): move backward; move in
"The people waiting in line are too close to
the door. We won't be able to open it unless
they back up."
back up (2): confirm a story, facts, or infor-
"If you don't believe me, talk to Dave. He'll
back me up."
back up (3): make a "protection" copy to
use if there are problems with the original.
"When my computer crashed, I lost many of
my files. It's a good thing I backed them up."
blow up (1): explode; destroy by exploding.
A: "That old building really came down
B: "That's because the construction company
used dynamite to blow it up."
blow up (2): suddenly become very angry.
"When I told Jerry that I'd had an accident
with his car, he blew up."
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