From Wiktionary, the free dictionary
erst recht
( idiomatic ) all the more ; a fortiori ; not less, but indeed more; even more definitely or determinedly
Synonyms: ( not always applicable ) umso mehr justament ( Austria ) Die Niederlage unseres Konkurrenten muss uns erst recht anspornen, heute Abend Bestleistung zu bringen. Our competitor’s defeat should be all the more incentive for us to show our best performance tonight. Wir wurden eingeschüchtert, damit wir den Streik absagen, aber jetzt streiken wir erst recht. We were intimidated to call off (i.e. 'they' tried to intimidate us into calling off) the strike, but now we’ll strike with even more determination. For non-idiomatic uses compare erst ( “ only ” ) and recht ( “ really, correctly ” ) . For example: Jetzt verstehe ich es erst recht . – “Only now do I really understand it.”
