What does "alongside" mean?

Along the side; by the side; side by side; abreast.

What is a synonym for "alongside"?

Common synonyms include: aboard, about, abreast, adjacent to, along, along.

Pronounced //əˌlɒŋˈsaɪd//.

/əˌlɒŋˈsaɪd/ adv, prep

adv, prep ·Moderate ·College level

Adverb

1
Along the side; by the side; side by side; abreast. not-comparable
"Ahoy! Bring your boat alongside."

Adverb

Preposition

"Houses were lined up alongside the highway."

From along + side; compare alongsides.