Dictionary.com
Thesaurus.com
Synonyms

on board

Idioms  

  1. Joining in or participating, as in The department head addressed the new employees, saying “Welcome on board,” or The opera company has a new vocal coach on board to help the soloists. This expression alludes to being on or in a vessel, airplane, or other vehicle. [Colloquial; second half of 1900s]

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Here’s why investors are getting back on board with AI.

From MarketWatch • Apr. 15, 2026

While on board, Christina Koch even asked Mission Control for help finding something essential: her favorite Honest hand lotion.

From The Wall Street Journal • Apr. 9, 2026

The toilet on board Orion is similar to the one on the International Space Station, but this is the first time it has been used on a crewed deep-space mission.

From Barron's • Apr. 9, 2026

I would be very curious to know right now what sort of conversations are happening, if any, between the National Archives and the Justice Department, and whether everyone is on board with this novel conclusion.

From Slate • Apr. 9, 2026

Her master, Captain Hudson, came on board the Astrea to ask news of home.

From "Carry On, Mr. Bowditch" by Jean Lee Latham

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.