Press button!
Meaning: This means to ask someone to push or apply force on a button, often to operate a machine or device. It's like saying, Please push the small object to operate this machine or device.
Choice of Words: Press is a verb that means to push or apply force on something. Button is a noun that means a small object that is pushed to operate a machine or device. When you put them together, "Press button" is an instruction asking someone to push or apply force on a button.
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Related Expressions