across
a-cross
preposition
On the opposite side of something from the speaker.
"The pub is across the road."
preposition
From one side to the other of a space or area.
"She walked across the field."
adverb
To meet or find something or someone by chance.
"I came across an old book."
adverb
Moving or extending from one side to the other.
"They swam across to the boat."