go by (Noun) — Small spiny-finned fish of coastal or brackish waters having a large head and elongated tapering body having the ventral fins modified as a sucker.
go by (Verb) — Become later by the passage of a given amount of time. ex. "three years went by"
go by (Verb) — Move past. ex. "A black limousine went by when she looked out the window"
go by (Verb) — Be called; go by a certain name. ex. "She goes by her maiden name again"
go by (Verb) — Be or act in accordance with. ex. "Go by this rule and you'll be safe"