Regardless of being descriptive, it has a fairly specific meaning. Refers to economies that mix market and state-run/non-market solutions, the latter of which is pretty much inimical to capitalist ideology and most of its methodology. Usually it's an economy that's mixed capitalism with the aspects of socialism or communism (if often more the economic ideologies than the practical implementations we've seen) that work to offset the areas where the former fails. Generally just functionally means the government has taken control in practice if not explicit law of certain major industries, to (attempt to) ensure their goals are specific results rather than profit.
If you really want to avoid using the term socialism 'cause it's as poisoned and largely devoid of substantive meaning as it is in the states in whatever context you're involved with, just replace references with "state-run", "non-profit", or "non-market solutions", stuff like that. You can talk about safety nets, infrastructure building, curtailing excesses, etc. You're still functionally talking about socialist or communist economic ideology, but it's not like you necessarily have to use the specific terms.
E: Though all that said, part of the point is that capitalism also has some rather bad ideas. Part of being a good advocate for a set of ideology and methodology like capitalism bundles up is being aware of its failings and limitations. And capitalism definitely has some. Do remember that if you're going hard for capitalism you're also defending stuff like the east india company, the business end of banana republics and whatnot, or all the shit businesses get up to environmentally if left unchecked (I'm pretty sure there's still parts of the US that are literally unliveable due to industrial pollutants, decades after the dumping was stopped). There's plenty of nasty shit going on with the stuff, and glossing over it does whoever you're discussing with no more favors than speaking of socialism without acknowledging the major implementation attempts have trended strongly towards bloody atrocity.