ukr.vitalinguist — How to say it in authentic Ukrainian

stick by
C2 verb — stick by sb

to continue to support someone when they are having problems

Authentic Ukrainian renderings

Confidence: high = attested in ≥3 sources OR ≥2 source classes; medium = 2 sources of same class; tentative = single source.

примеtentativeverb, perfective✓ modern UA ×31 source, 1 hite2u:Українсько-англійський словник

Bilingual dictionary attestations (1 dicts, 1 rows)

Українсько-англійський словник
примерза́ти (-а́ю, -а́єш) I vi; приме́рзнути, приме́рзти (-ну, -неш) Р vi to freeze somewhat; to freeze together with; to stick by freezing.

Live source: https://e2u.org.ua/s?w=stick%20by&highlight=on