Hodl / Hodl / Hodl ^Hmf^
Spending doesn't kill the coin, it increases merchant adoption, therefore increasing the utility of Bitcoin.
Sure, the merchant will convert to fiat and add sell pressure that way, but you can just buy back your Bitcoin and it would be like you only spend fiat.
Now you neutralized the sell of the merchant with your own buy, but you also added Bitcoin transactions to the merchants revenue, and the merchant made less fiat revenue. If enough holders use this tactic for their everyday purchases the merchants will notice Bitcoin is a serious payment option and they will be more inclined to accept Bitcoin and maybe even hold a little bit. Without undermining your own hold position.