To waste time doing nothing productive, or to behave in an irresponsible, unfocused way.
"The teacher told the class to stop screwing around and open their textbooks."
To waste time behaving irresponsibly, to be sexually unfaithful, or to tamper with something carelessly.
To waste time being silly or irresponsible, or to be unfaithful to a partner.
3 meanings, ordered from most common to least. Color-coded by CEFR level.
To waste time doing nothing productive, or to behave in an irresponsible, unfocused way.
"The teacher told the class to stop screwing around and open their textbooks."
To be sexually unfaithful to a partner.
"She found out he had been screwing around behind her back for months."
To tamper with or interfere carelessly with something.
"Don't screw around with the firewall settings unless you know what you're doing."
Mildly vulgar. The sexual infidelity sense is common but should be used carefully. 'Screwing around with' something means tampering carelessly (e.g. 'stop screwing around with the settings'). More common in American English.
Natural word combinations native speakers use most often.
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