Crosswise and Side by side

Crosswise adverb - In a line or direction running from corner to corner.

Side by side and crosswise are semantically related. In some cases you can use "Side by side" instead an adverb "Crosswise".

Side by side adjective - Nearest in space or position; immediately adjoining without intervening space.

Crosswise and side by side are semantically related. Sometimes you can use "Crosswise" instead an adverb phrase "Side by side".