From Wiktionary, the free dictionary
сти́снуло • (stísnulo)
- neuter singular past indicative perfective of сти́снуть (stísnutʹ)
See the etymology of the corresponding lemma form.
сти́снуло • (stýsnulo)
- neuter singular past indicative of сти́снути pf (stýsnuty)
- Synonym: сти́сло (stýslo)