Maintains, as a violin

• Some pine extracts
• Substances for Strads
• Prepares to bow
• Rubs with a sticky substance
• Prepares a bow, with "up"
• Maintains, as a violin bow
• Anti-slippage substances
• Treats, as a bow

Wiktionary Word definitions in Wiktionary
n. (plural of rosin English) vb. (en-third-person singular of: rosin )