Puts a sale price on, maybe

• Marks sales prices
• Corrects, as an ID on Facebook
• Puts a sale sticker on, perhaps
• Marks up or down, say
• Puts new prices on, maybe
• Marks down, perhaps
• Changes prices, perhaps
• Labels again
• Changes a name on, as a Facebook photo

Wiktionary Word definitions in Wiktionary
vb. (en-third-person singular of: retag )