to say thank you to someone
dire merci à quelqu'un (dire merci à quelqu'un)
"He expressed his thanks to the organizers of the conference."
"Il a exprimé ses remerciements à l'organisateur de la conférence." (Il a exprimé ses remerciements à l'organisateur de la conférence)
to show regard or consideration for someone or something
to become a member of a sports team or group
to use or reduce a supply of something
to simplify a process to make it more efficient
to start selling in new regions or countries
to reduce spending or expenses