Walked up to

Yes, it's correct English, but it would be helpful to know the context in which you intend to say it.

Vincent TeoCan I say,

They walked up to the bus.

Yes. You can walk up to anything or anybody.

They walked up to the bank.
They walked up to the crowd.
They walked up to the door.
They walked up to me.

It's the same as "approach".

They approached the bank.
They approached the crowd.
They appro

Thanks, but I mean:

They walked up to the bus = They boarded the bus.

Are they same in meaning?

Vincent Teo
They walked up to the bus = They boarded the bus.

Are they same in meaning?

Not really. "They walked up to the bus" means that they walked to a position next to or very close to the bus, but it doesn't say that they actually boarded it. If you mean "They boarded the bus" then that's what you should say.

Vincent TeoThey walked up to the bus = They boarded the bus.

Are they same in meaning?

No, no, no!!! They did not board the bus if they just walked up to it. They can board the bus after they walk up to it, however.

Sometimes people say "They walked up into the bus" when they mean "They boarded the bus". Maybe you are confusing