ADD UP (2), SET UP (3)

add up = accumulate, gather little by little and gradually become a lot

examples:

• Mary washes cars, cleans houses, irons people's clothes for money, babysits. With all these kinds of work money adds up and it is almost a regular salary. 
• Money can' t add up if you keep spending all the time. 
• Since my mother moved in with us, I 'm afraid our problems have added up.
• If you save some euros every week you 'll see how quickly it adds up and you 'll be able to buy that motorcycle. 
• He spends a lot on food, a lot on his amusement, a lot on drinks. By the end of the month when he receives bills too all expenses add up and he is left broke.
• First, he was rude to me. Then he started making fun of me in front of others. Sometimes he teased me for my accent. It all adds up and now I don 't want to see him anymore.

set up = build, put something in a place

examples:

• After the accident the police set up roadblocks on the road.
• They should have set up a STOP sign here. It 's really dangerous.
• The government set up tents for the people who were left homeless after the earthquake.
• The Town Hall set up a medical unit near the block of flats that had caught fire.
• When we reached the top of the mountain we set up a flag.
• They set up a new branch of these clothes stores in our city.
• Could you please set up your videocameras over there? You 're blocking the light here.
• We set an iron fence up all around the garden.