To make something gallant; to dress up or embellish in a showy, refined manner.
From gallant + -ize (suffix meaning to make or cause to become). This is a relatively rare formation following standard English word-building patterns.
The -ize suffix is one of the most productive tools in English—you can gallantize almost anything, but the fact that we rarely use it shows that we don't talk about making things 'gallant' in our everyday world anymore!
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