LSJ
to be in motion under, metaph, ἀμφιβολία τις ὑφορμῶσα τῇ διανοίᾳ Adam. Vent. 36 (fort. ὑφορμοῦσα, v. ὑφορμέω 1 fin.); — Pass., aor. part. ὑφορμηθέντα darting back, read by Ar.Byz. for ἐφ- in Il. 16.313.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)