Buy
Buy verb - To get possession of (something) by giving money in exchange for.
Sign up
Sign up verb - Engage by written agreement.
Buy and sign up are semantically related in contribute topic. Sometimes you can use "Buy" instead a verb "Sign up", if it concerns topics such as come to terms.
Both terms in one sentence
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For a time, there was a hoax website called Man Beef.com, where people could (purportedly) sign up for a membership that would allow them to buy cuts of human meat.
Source: To Serve Man -
You can sign up and fly from L1 to L100 for free, but you need cash credits to buy Enchant protect cards, item seeker units, and fancy holographic banner-like things you can attach to your airframe.
Source: Allegedly Free Game - When Emmett became assistant manager at the Buy More there was a big sign up - "Under New Assistant Management" - and when he became manager he put the sign up again with the word "Assistant" Xed out.
Source: Under New Management
Cite this Source
Sign up and Buy. (2016). Retrieved 2026, August 02, from https://thesaurus.plus/related/buy/sign_up
Buy & Sign up. N.p., 2016. Web. 02 Aug. 2026. <https://thesaurus.plus/related/buy/sign_up>.
Sign up or Buy. 2016. Accessed August 02, 2026. https://thesaurus.plus/related/buy/sign_up.
Google Ngram Viewer shows how "buy" and "sign up" have occurred on timeline