Saturn square Lilith (orb 1.9°) creates concrete friction between the two planets. The orb is very tight; this describes a stable character pattern more than a passing reaction.
Here, Saturn in Gemini in House 10 brings discipline, constraint, endurance, and mastery into House 10 (vocation, status, responsibility, and public image), with Gemini style (curiosity, language, movement, and mental adaptation); Lilith in Pisces in House 7 brings pure ideal, absolute demand, fascination, and refusal of compromise into House 7 (relationship, confrontation, and the mirror of others), with Pisces style (imagination, faith, compassion, dream, and permeability).
Concrete friction: this aspect puts Saturn (discipline, constraint, endurance, and mastery) and Lilith (pure ideal, absolute demand, fascination, and refusal of compromise) into repeated friction: one can interrupt, inhibit, or provoke the other in concrete situations. House 10 (vocation, status, responsibility, and public image) is in friction with House 7 (relationship, confrontation, and the mirror of others); this can create blockage, inhibition, overreaction, or repeated conflict between the two fields.