Meaning of “smoothly” in the English Dictionary

british dictionary

"smoothly" in British English

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smoothlyadverb

uk /ˈsmuːð.li/ us /ˈsmuːð.li/

B2 easily and without interruption or difficulty:

The road was blocked for two hours after the accident, but traffic is now flowing smoothly again.
Lead is added to fuel to make car engines run more smoothly.
The pregnancy's gone very smoothly so far.
If all goes smoothly, we should arrive by nine o'clock.

C2 without any sudden movements or changes:

I drove through the gates, which closed smoothly behind me.

(Definition of “smoothly” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"smoothly" in American English

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smoothlyadverb

us /ˈsmuð·li/

easily and without interruption or difficulty:

Oil is used to make the parts of a machine move smoothly when they rub together.
It’s nice to work in such a smoothly run office.

(Definition of “smoothly” from the Cambridge Academic Content Dictionary © Cambridge University Press)