Lower
Lower verb - To reduce to a lower standing in one's own eyes or in others' eyes.
Usage example: how could you lower yourself by passing off someone else's work as your own?
Upgrade
Upgrade verb - To move higher in rank or position.
Usage example: upgraded them to first class
Common collocations
Both words in one sentence
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The HMS Courageous also has 2 missile batteries but has a higher Weapons upgrade cap, allowing for more missiles per salvo (The Blackavar has a lower cap but a significantly higher reload rate).
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Normally, the player has to get the Diffusion Missile upgrade to escape from the lower levels of Sector 4.
Source: Sequence Breaking - A few reasons: One, it's the cheapest weapon to upgrade in the game, this means it can be fully upgraded at a much lower cost than some of the pricier, flashier attacks.
Cite this Source
Upgrade and Lower. (2016). Retrieved 2023, March 21, from https://thesaurus.plus/related/lower/upgrade
Lower & Upgrade. N.p., 2016. Web. 21 Mar. 2023. <https://thesaurus.plus/related/lower/upgrade>.
Upgrade or Lower. 2016. Accessed March 21, 2023. https://thesaurus.plus/related/lower/upgrade.
Google Ngram Viewer shows how "lower" and "upgrade" have occurred on timeline