Let's say I'm working on a science experiment with a partner. We are designing a board with, say, 2 bulbs on it. Normally, when you turn it on, the bulbs should light. Yesterday, I worked on it alone. I flipped the switch and only one bulb turned on whereas the other flashed. Today, when I told my partner he accused me of breaking it. so I said, "Just because it [broke] when I used it doesn't mean it was my fault"
What's the right verb to use? The bulb is still intact. It flickers. So can I use 'break"?
Thanks in advance.
Just because it didn't work properly when I used it doesn't mean it was my fault.
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Optilang, Woudl it be better tosay 'Just because it stopped working properly" instead since it worked before I went in to work on it alone?
Either would be OK.

It didn't work properly when you used it.

It had been working before.

It stopped working properly when you used it.
Thanks, Optilang.
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